A marine battery has to do two jobs that do not always get along: start an engine with a strong burst of current, then keep electronics, pumps, lights, or a trolling motor running after the engine is off. The wrong battery can fit the compartment and still be a poor match for the boat.
The 10 Best Marine Battery options below cover sealed AGM designs and newer LiFePO4 batteries. Some are built around engine starting, while others are intended strictly for deep-cycle energy storage. Group size, charging requirements, weight, and cranking output matter more here than a long list of marketing claims.
For most boaters, Interstate Batteries Marine/RV Battery is the best all-around pick, with OPTIMA D34M BLUETOP close behind for a lighter dual-purpose AGM design. The rest range from compact trolling-motor batteries to high-output lithium replacements.
| # | Product | Award | Capacity | Starting output | Best for |
|---|---|---|---|---|---|
| 1 | Interstate Marine/RV Battery | Best overall | 12V, 100Ah | 825 CCA | Boats and RVs needing one battery for starting and accessories |
| 2 | OPTIMA D34M BLUETOP | Best dual-purpose AGM | 12V, 55Ah C20 | 750 CCA, 870 MCA | Compact starting and accessory setups |
| 3 | Newport 12V 50Ah AGM | Best lightweight AGM | 12V, 50Ah | Not specified | Trolling motors and portable marine setups |
| 4 | Weize Group 31M AGM | Best high-capacity AGM | 12V, 110Ah | 825 CCA | Larger boats and RVs with heavy accessory loads |
| 5 | OPTIMA 34M BLUETOP | Best starting AGM | 12V, 50Ah C20 | 800 CCA, 1000 MCA | Engine-first marine starting |
| 6 | Mighty Max MM-G24M | Best Group 24 AGM | 12V, 90Ah | 550 CCA, 700 MCA | Group 24 replacements with accessory support |
| 7 | VEMDIA Group 31 LiFePO4 | Best lithium cycle life | 12V, 100Ah | Not specified | Trolling motors and repeated deep discharges |
| 8 | SUPER EMPOWER Group 24 LiFePO4 | Best lithium house battery | 12V, 100Ah | Not suitable for starting | Auxiliary marine power and trolling motors |
| 9 | Mighty Max MM-G27M | Best Group 27 AGM | 12V, 100Ah | 850 MCA | Large Group 27 AGM installations |
| 10 | Redodo Group 27 Bluetooth | Best smart lithium | 12V, 100Ah | 900 CCA, 1000 MCA | Lithium starting and remote battery monitoring |
1. Interstate Marine/RV Battery: Best Overall
Pros
- 100Ah capacity supports extended accessory use
- 825 CCA gives it serious starting power
- Pure-lead AGM construction is sealed and maintenance-free
- Dual-purpose design covers starting and deep-cycle duties
Cons
- Heavy at 64.5 pounds
- Group 31 footprint needs a suitable battery compartment
- Battery charger compatibility still matters
Best for: boat and RV owners who want one substantial AGM battery for starting and extended accessory use.
The Interstate Marine/RV Battery is the least compromised pick in this group. It has the capacity to run boat accessories for a meaningful stretch, but it does not give up the strong starting output needed when the engine has been sitting. Its 100Ah rating and 825 CCA make the basic role clear: this is a large dual-purpose battery, not a small trolling-motor battery pressed into starting duty.
The pure-lead AGM construction is the interesting part. Interstate says the battery uses thick plates designed for repeated discharge and recharge, and that it should last longer than conventional alloy AGM and flooded batteries. The sealed format also avoids adding water and reduces the mess associated with a flooded battery. AGM is still heavy, though, and 64.5 pounds is a real handling penalty when the battery is deep in a boat compartment.
Its Group 31M size makes it a better fit for larger marine and RV installations than the Newport 12V 50Ah AGM. The Interstate also has substantially more reserve for lights, pumps, televisions, and other accessories than the OPTIMA D34M BLUETOP. The tradeoff is weight. If moving a battery in and out of a small boat is part of your routine, the lithium options are far easier to live with.
This is not the right choice for someone who only needs a compact trolling-motor battery, and its large capacity does not remove the need for a properly matched charger. For a boat that needs dependable engine starting plus deep-cycle support in one sealed AGM package, the Interstate is the one we'd keep.
2. OPTIMA D34M BLUETOP: Best Dual-Purpose AGM
Pros
- 750 CCA and 870 MCA support dependable starting
- SpiralCell construction is designed for vibration resistance
- 120-minute reserve capacity
- Dual SAE and 5/16-inch stainless steel stud posts
Cons
- 55Ah capacity is lower than most batteries here
- Heavier than the lithium alternatives
- Less deep-cycle headroom than the Interstate
Best for: boaters who want a compact, vibration-resistant AGM for starting and moderate accessory use.
The OPTIMA D34M BLUETOP feels like a starting battery that has been given enough reserve to handle secondary duties. Its 43.5-pound weight is manageable for an AGM, and the 10.06 by 6.88 by 7.94-inch dimensions suit installations where a Group 31 battery would be awkward. This is the pick for a smaller boat where engine reliability matters more than running accessories all day.
OPTIMA lists 750 CCA, 870 MCA, and a 55Ah C20 capacity. CCA speaks to cold starting, while MCA is measured at a warmer temperature commonly associated with marine starting conditions. The 120-minute reserve capacity gives the battery some endurance once the engine is off, but the lower amp-hour figure means it is not the strongest choice for a large electronics load.
The SpiralCell design uses 99.99 percent pure lead and is advertised as having much higher vibration resistance than a standard flooded battery. On a boat that pounds across chop, that construction is more relevant than a flashy feature list. Dual SAE and 5/16-inch stainless steel stud posts also make it easier to match common marine cable arrangements.
Compared with the Interstate Marine/RV Battery, the D34M BLUETOP is lighter and easier to package, but it gives up capacity and some starting output. Compared with the OPTIMA 34M BLUETOP, it has the more useful dual-purpose emphasis and greater reserve capacity. Skip it if a trolling motor or large accessory bank will be drawing power for hours. Choose it when a compact, sealed starting battery needs to handle occasional deep-cycle work.
3. Newport 12V 50Ah AGM: Best Lightweight AGM
Pros
- Weighs 32 pounds
- Sealed, leak-proof AGM design
- Explicitly intended for trolling motors
- 50Ah deep-cycle capacity
Cons
- Starting output is not specified
- Less capacity than the 100Ah options
- Large stated dimensions for its capacity
Best for: smaller boats and anglers who need a portable 12V deep-cycle battery for a trolling motor.
The Newport 12V 50Ah AGM makes sense when the job is simple: power a trolling motor or marine electrical system without carrying a full-size Group 31 battery. At 32 pounds, it is the easiest lead-acid option here to lift, install, and remove. That matters on small boats where a battery may need to come out after every outing.
Its 12V output and 50Ah capacity are aimed at deep-cycle use. Newport specifically calls out trolling-motor compatibility, and the sealed AGM format is leak-proof and maintenance-free. There is no stated CCA or MCA figure, so we would not treat this as an engine-starting battery. That omission is important, especially for anyone replacing a dual-purpose battery.
The dimensions listed are 13 by 6.75 by 9.9 inches. Measure the compartment rather than assuming the relatively modest capacity means a small case. The Newport is also much lighter than the Interstate and Weize batteries, but it cannot match their 100Ah or 110Ah reserve for long accessory sessions.
For charging, use a setup intended for a 12V AGM battery rather than assuming any marine charger will do. A charger suited to maintaining marine batteries can help prevent the undercharging that shortens lead-acid battery life. Pick the Newport when portability and trolling-motor use come first. Skip it if the same battery must crank a large outboard.
4. Weize Group 31M AGM: Best High-Capacity AGM
Pros
- 110Ah capacity is the highest among the AGM picks
- 825 CCA supports engine starting
- 240-minute reserve capacity
- Sealed design resists vibration and leaks
Cons
- Very heavy at 67.47 pounds
- Terminal orientation needs careful checking
- Group 31 dimensions require a large compartment
Best for: boats and RVs with substantial accessory demands and room for a heavy Group 31 battery.
The Weize Group 31M AGM is built for the owner who would rather have extra reserve than a lighter installation. Its 110Ah capacity is the highest among the AGM batteries here, and the 825 CCA output keeps it relevant as an engine-starting battery. It is a true dual-purpose design, with deep-cycle capability for electronics, lights, pumps, and other RV or marine equipment.
The listed 240-minute reserve capacity is useful context. Reserve capacity indicates how long a battery can support a specified load under a standardized test, so it is not the same thing as unlimited accessory runtime. Still, the figure points to more endurance than the smaller OPTIMA batteries. Weize also specifies a maximum charging current of 21A and a constant-voltage target of 14.4 plus or minus 0.1V, details that should be followed with a compatible charger.
At 67.47 pounds, this is the heaviest product in the roundup. Its listed dimensions are 12.99 by 6.81 by 8.35 inches, and the positive terminal is on the left with the negative on the right. That terminal layout can make or break an installation, so check the existing cables before ordering. The sealed AGM case is designed to resist leaks, corrosion, and vibration, but it does not make the battery easy to move.
The Interstate Marine/RV Battery is a more polished all-around recommendation, while the Weize makes the stronger case when maximum AGM capacity is the priority. The weight rules it out for portable boats, and a lithium battery will be dramatically easier to handle. Choose it for a fixed installation with high accessory demand and a properly sized charging system.
5. OPTIMA 34M BLUETOP: Best Starting AGM
Pros
- 800 CCA and 1000 MCA
- 100-minute reserve capacity
- 38.4-pound weight
- Vibration-resistant SpiralCell construction
Cons
- Only 50Ah C20 capacity
- Starting-focused design is less suited to long accessory use
- Dimensions need to match the existing battery tray
Best for: boaters who prioritize strong outboard starting and want a sealed AGM battery.
The OPTIMA 34M BLUETOP is the engine-first option in this lineup. It supplies 800 CCA and 1000 MCA, the highest listed marine cranking figure among the AGM batteries here. That makes it a natural fit for a boat where the battery's main responsibility is starting the outboard reliably, with only moderate accessory use afterward.
Its 50Ah C20 capacity and 100-minute reserve capacity tell a different story from the Weize Group 31M. The OPTIMA can support some electronics and accessories, but it is not the battery we'd choose for long trolling-motor sessions or a large onboard load. At 38.4 pounds, it is also considerably easier to handle than the large Group 31 products.
The case measures 10 by 6.88 by 7.8 inches, and the battery uses dual SAE and 5/16-inch stainless steel stud posts. OPTIMA's SpiralCell technology uses 99.99 percent pure lead and is designed to withstand vibration better than conventional flooded construction. That is a meaningful advantage for boats that see rough water or frequent transport.
The D34M BLUETOP is the more balanced OPTIMA because it has greater reserve capacity, while the 34M wins when starting output takes priority. The Interstate is a better choice for broad dual-purpose use, and the lithium options win on weight. Buy this one for a starting battery with marine-ready construction, not as a substitute for a dedicated deep-cycle bank.
6. Mighty Max MM-G24M: Best Group 24 AGM
Pros
- 90Ah deep-cycle capacity
- 550 CCA and 700 MCA
- 145-minute reserve capacity
- Spill-proof AGM construction with an ABS shell
Cons
- Weighs 54.4 pounds
- Lower starting output than the larger AGM picks
- Group 24 fit must be confirmed
Best for: boaters replacing a Group 24 battery who need both accessory endurance and engine-starting ability.
The Mighty Max MM-G24M fills a common middle ground. Its 90Ah capacity is enough for meaningful deep-cycle use, while 550 CCA and 700 MCA give it legitimate engine-starting ability. It is not as powerful as the OPTIMA 34M BLUETOP, and it does not have the reserve of the Weize, but it is a practical match for a Group 24 installation.
Mighty Max lists 145 minutes of reserve capacity and up to 700 cycles at 50 percent depth of discharge. Depth of discharge matters because repeatedly draining a lead-acid battery deeply is harder on it than using only part of its stored energy. The stated cycle figure therefore describes a specific usage condition, not a promise that every installation will see the same result.
The battery measures 10.25 by 6.63 by 9.13 inches and weighs 54.4 pounds. Its ABS shell is intended to resist impacts and heat, while the AGM construction is spill-proof and maintenance-free. That is a sturdy package, though the weight is closer to the large batteries than to the compact OPTIMA models.
The MM-G24M beats the Newport on starting capability and capacity, but the Newport is 22.4 pounds lighter. The Weize gives you more reserve, though it also demands more room and lifting strength. Choose Mighty Max when the boat already uses Group 24 hardware and needs a balanced AGM replacement.
7. VEMDIA Group 31 LiFePO4: Best Lithium Cycle Life
Pros
- 100Ah capacity
- 24-pound weight
- Smart 100A BMS
- Low-temperature charging cutoff
- Stated cycle life up to 15, 000 cycles at 60 percent depth of discharge
Cons
- Charging below 32°F is disabled
- Lithium charging equipment is required
- Starting capability is not specified
Best for: marine deep-cycle applications where low weight and repeated discharge matter more than engine cranking.
The VEMDIA Group 31 LiFePO4 is a dramatic change from the heavy AGM batteries above. It weighs 24 pounds while offering 100Ah of capacity, making it much easier to install in a trolling-motor compartment or carry between a boat and an RV. The battery is intended as a Group 31 replacement, with stated dimensions of 12.9 by 6.7 by 8.5 inches.
Its 100A smart battery-management system protects against overcharge, over-discharge, over-current, and short circuits. The low-temperature cutoff is especially important for lithium chemistry. Charging stops below 32°F, while discharge is specified down to minus 4°F. That protects the cells, but it also means a cold-weather charging plan is necessary rather than optional.
VEMDIA states up to 15, 000 cycles at 60 percent depth of discharge, more than 8, 000 at 80 percent, and 6, 000 at 100 percent. These figures describe different usage levels, so they should not be read as a single guaranteed lifespan. The battery can also be configured up to 4S4P, according to the product information, for larger systems.
This is not the replacement we'd choose for an engine-starting battery because no starting output is specified. The SUPER EMPOWER Group 24 LiFePO4 is similarly deep-cycle-focused, but the VEMDIA offers a Group 31 form factor and a lower stated weight than either large AGM. Pair it with a LiFePO4-compatible charger and choose it for repeated trolling-motor or house-power cycles.
8. SUPER EMPOWER Group 24 LiFePO4: Best Lithium House Battery
Pros
- 100Ah capacity in a Group 24 case
- Weighs 21.58 pounds
- Integrated 100A BMS
- Low-temperature charging and discharge protection
- Five-year warranty
Cons
- Not suitable for engine starting
- Requires a lithium charging profile
- Cold-weather charging pauses below 32°F
Best for: auxiliary marine power, trolling motors, and house loads that do not require engine cranking.
The SUPER EMPOWER Group 24 LiFePO4 is unusually clear about its role. It is designed for deep-cycle energy storage and explicitly says it is not suitable for engine starting or cranking. That honesty makes it easier to recommend, provided the buyer is building an auxiliary system rather than replacing the boat's starting battery.
It provides 100Ah in a case measuring 10.24 by 6.49 by 8.98 inches, and the listed weight is only 21.58 pounds. The Group 24 format should fit many standard battery boxes, though the M8 terminals and actual tray dimensions still need checking. Compared with the 54.4-pound Mighty Max MM-G24M, this is a much easier battery to lift and carry.
The integrated 100A BMS protects against overcharge, over-discharge, overcurrent, short circuits, and temperature problems. Charging should use a 14.4 to 14.6V lithium profile, and the battery can work with solar systems when the controller is set to lithium mode. Charging stops below 32°F and discharge stops at minus 4°F, resuming when the stated temperature thresholds are reached.
The VEMDIA offers the larger Group 31 format and a longer stated cycle-life claim, while the SUPER EMPOWER is easier to fit in a Group 24 compartment and includes a five-year warranty. Neither belongs in a starting-battery slot. Pick this model for a trolling motor or auxiliary bank, and use a dedicated starting battery for the engine.
9. Mighty Max MM-G27M: Best Group 27 AGM
Pros
- 100Ah deep-cycle capacity
- 850 MCA
- 170-minute reserve capacity
- Spill-proof AGM case with ABS protection
Cons
- Very heavy at 63.7 pounds
- Large overall dimensions
- Product information does not clearly state CCA
Best for: Group 27 installations that need a substantial dual-purpose AGM battery.
The Mighty Max MM-G27M is the heavy-duty Group 27 choice. It combines 100Ah of deep-cycle capacity with 850 MCA, giving it the endurance for accessories and the marine cranking output for starting. The 170-minute reserve capacity places it ahead of the smaller Group 24 model for sustained loads.
There is an awkward detail in the listing: the title presents an 800 CCA figure, while the feature text contains a conflicting 80 CCA statement and separately lists 850 MCA. Because of that inconsistency, the 850 MCA figure is the clearer starting specification to use when comparing it. Buyers who need a precise cold-cranking rating should verify the current product documentation before ordering.
The battery measures 12.06 by 6.62 by 9.25 inches, and its listed weight is 63.7 pounds. The ABS casing is intended to resist impact and heat, and the AGM construction is spill-proof and maintenance-free. This is a fixed-installation battery, not something we'd want to remove from a boat after every trip.
The Interstate Marine/RV Battery has a cleaner, more complete specification set and is easier to recommend broadly. The MM-G27M makes sense when the existing tray calls for Group 27 and its 100Ah capacity, 850 MCA, and 170-minute reserve fit the job. Skip it for portable use or when the conflicting starting specification is a dealbreaker.
10. Redodo Group 27 Bluetooth: Best Smart Lithium
Pros
- 900 CCA and 1000 MCA
- Bluetooth monitoring and remote control
- IP67 waterproof housing
- 23.1-pound weight
- Automatic reserve for engine starting
Cons
- Requires the correct charger or DC-to-DC converter
- Not compatible with generators without a built-in voltage regulator
- Taller dimensions than some Group 27 batteries
Best for: boaters who want lithium starting power, app monitoring, and a lightweight Group 27 installation.
The Redodo Group 27 Bluetooth is the most feature-rich battery here, and its purpose is broader than a standard trolling-motor lithium pack. It lists 900 CCA and 1000 MCA for engine starting, while also supporting deep-cycle power for onboard devices. At 23.1 pounds, it is far easier to install than the 63.7-pound Mighty Max MM-G27M.
Bluetooth monitoring is the headline feature. The app can show battery status and control a shutdown, while the OTA function allows updates through the connection. Redodo also says the battery reserves about 25 percent of its energy for starting and supports a forced restart through the app or a button hold. Those controls are useful, but they add setup and charging considerations that do not exist with a basic AGM.
The housing is rated IP67, and the white casing is intended to reduce heat absorption. Redodo lists 5000 or more start times and 4000 or more deep cycles at 100 percent depth of discharge, along with protection for overcharge, over-discharge, short circuit, and high and low temperature conditions. The Group 27 dimensions are listed as 10.1 by 6.92 by 5.58 inches in the features, while the product information lists 12.13 by 6.69 by 8.31 inches, so confirm the physical measurements with the seller before committing to a tight compartment.
The Redodo is more sophisticated than the VEMDIA and SUPER EMPOWER batteries because it is designed for starting as well as deep-cycle work. It is also more demanding: the product specifically calls for a suitable charger or DC-to-DC converter and warns against generators without built-in voltage regulation. Choose it when app control and lithium starting output justify the extra system checks.
How to choose best marine battery
The right marine battery depends on the boat's starting system, accessory load, available compartment, and charging equipment. These are the factors that should decide the purchase.
Battery role
Starting batteries provide a short, powerful burst for the engine. Deep-cycle batteries provide steadier energy over a longer period for trolling motors and accessories. Dual-purpose AGM models such as the Interstate Marine/RV Battery and OPTIMA D34M BLUETOP try to cover both jobs, while the SUPER EMPOWER Group 24 LiFePO4 is explicitly for energy storage and should not be used for cranking.
A battery that runs a trolling motor well may still be the wrong battery to start the boat.
Capacity and reserve
Amp-hour capacity indicates how much stored energy is available under specified test conditions. Higher capacity is useful for electronics, pumps, lights, and trolling motors, but it often comes with more weight and a larger case. Reserve capacity provides another comparison point for lead-acid batteries, although it is based on a standardized load rather than your exact onboard equipment.
The Weize Group 31M offers 110Ah, while the Interstate, Mighty Max MM-G27M, and the lithium deep-cycle models provide 100Ah. The Newport's 50Ah is better suited to a smaller load or shorter outings.
Cranking output
CCA measures starting current under a cold-temperature test, while MCA uses a warmer marine-oriented test condition. Compare like with like, and do not assume a high amp-hour rating means strong starting output. The OPTIMA 34M BLUETOP lists 800 CCA and 1000 MCA, while the Redodo lists 900 CCA and 1000 MCA.
Be cautious when a listing contains conflicting figures. The Mighty Max MM-G27M has an inconsistent CCA statement in its product information, so its specified 850 MCA is the more dependable comparison point from the supplied details.
Battery chemistry
AGM batteries are sealed, maintenance-free lead-acid designs with good vibration resistance and familiar charging requirements. LiFePO4 batteries are much lighter and suited to repeated deep discharges, but they need lithium-compatible charging equipment and may stop charging in freezing temperatures.
Lithium is not an automatic upgrade for every boat. Check the alternator, charger, battery-management system, and engine-starting requirements before swapping chemistries.
Fit and terminal layout
Group size is a useful starting point, not a guarantee that every battery will fit. Check length, width, height, hold-down hardware, terminal position, and cable reach. The Weize Group 31M lists the positive terminal on the left, while several lithium batteries use different terminal arrangements or M8 posts.
The listed dimensions also vary in the product information for some entries. A tape measure and the existing battery label are more useful than choosing by group number alone.
Charging and cold weather
AGM batteries need an appropriate lead-acid charging profile. Lithium batteries need a LiFePO4 profile, and the VEMDIA and SUPER EMPOWER models stop charging below 32°F. The Redodo also requires the correct charger or DC-to-DC converter and warns about generators without built-in voltage regulation.
A quality charger and correct settings can prevent undercharging, overheating, and premature battery-management shutdowns. For troubleshooting or setup, a multimeter can reveal charging and connection problems before they become an on-water failure.
Frequently asked questions
Can a marine battery start an engine and run a trolling motor?
A dual-purpose battery is designed for both starting and deep-cycle use, so models such as the Interstate Marine/RV Battery and OPTIMA D34M BLUETOP can handle both roles. A dedicated deep-cycle battery may run a trolling motor well but may not provide the required cranking output. Check the engine's starting specification before combining the jobs.
Is AGM or LiFePO4 better for a boat?
AGM is simpler if the boat already uses lead-acid charging equipment and needs a sealed, vibration-resistant battery. LiFePO4 is much lighter and generally better suited to repeated deep discharges, but it needs compatible charging equipment and has cold-weather charging limits. The right chemistry depends on the full electrical system, not just the battery compartment.
What does Group 31 mean?
Group 31 identifies a common battery size and terminal arrangement category. It does not tell you the battery's capacity, chemistry, or starting output. Measure the compartment and check the terminals before replacing an existing battery.
Can a LiFePO4 battery be used as an engine starter?
Only if the battery is specifically designed and rated for engine starting. The SUPER EMPOWER Group 24 LiFePO4 says it is not suitable for starting, while the Redodo Group 27 is marketed as a dual-purpose starting and deep-cycle battery. Do not infer starting capability from a 100Ah rating alone.
Do sealed AGM batteries need maintenance?
Sealed AGM batteries do not require the water refilling associated with flooded lead-acid batteries. They still need correct charging, clean connections, secure mounting, and protection from prolonged undercharging. Maintenance-free does not mean installation-free.
Does more CCA mean longer accessory runtime?
No. CCA describes starting output, while amp-hour capacity and reserve capacity relate more closely to extended accessory use. A battery can have very high CCA and modest capacity, as seen with the OPTIMA 34M BLUETOP. Choose capacity for the load and cranking output for the engine.
Can a marine battery also power an RV?
Several dual-purpose models in this roundup are marketed for both marine and RV use, including the Interstate, Weize, and OPTIMA D34M BLUETOP. Confirm the RV's battery type, charging profile, compartment size, and expected load. A deep-cycle lithium battery may be a better house battery, but it may not be appropriate for starting.
The bottom line
The Best marine battery for most mixed-use installations is the Interstate Marine/RV Battery. Its 100Ah capacity, 825 CCA, pure-lead AGM construction, and dual-purpose design give it the broadest fit for boats and RVs that need both engine starting and accessory power. Its weakness is weight, so it is not the choice for a battery that must be carried frequently.
For a lighter installation, the OPTIMA D34M BLUETOP is the strongest AGM alternative, while the VEMDIA Group 31 LiFePO4 is the more compelling deep-cycle upgrade when compatible charging equipment is already in place. The Redodo Group 27 is the specialist pick for buyers who want lithium starting power and Bluetooth control.
If you are undecided, choose AGM for simpler compatibility and LiFePO4 for lower weight and repeated deep-cycle use.
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