Deep Cycle Marine Battery

ExpertPower EP12100 12V 100Ah Lithium LiFePO4 Deep Cycle Battery

ExpertPower EP12100 is a very popular Group 31 deep cycle battery based on Lithium Iron Phosphate (LiFePO4) chemistry.

ExpertPower EP12100 is an ultralight battery, being able to withstand a large number of charging/discharging cycles, and accepting the charge rather fast, allowing multi-cycle use on a daily basis.

Published: June 16, 2021.

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ExpertPower EP12100 Battery Features and Specifications

Physical dimensions of the ExpertPower EP12100 battery are (L x W x H) 13 x 6.8 x 8.4/9.3 inches (~330 x 173 x 214/237 mm) and it belongs to the BCI Group 31.

Also, the battery weighs only 22.6 lbs (~10.3 kg), which is ~3x less than the typical 12V 100Ah lead-acid Group 31 battery.

The nominal voltage of the ExpertPower EP12100 battery is 12.8 volts and the nominal capacity is 100 Ah.

Note: Nominal capacity is measured at 0.2C discharge current and at 25°C - ExpertPower EP12100 is able to provide 20 Amps for 5 hours and 25 Amps for almost 4 hours, hence it has a Reserve Capacity rating of ~240 minutes, which is a much better rating than RC rating of 100Ah AGM/Gel lead-acid batteries (usually <200 minutes).


ExpertPower EP12100 features F12/M8 battery terminals, ensuring a firm connection between the battery and wires.

During the discharge, most of the time (practically >95% of discharge time), the output voltage is >12V, making ExpertPower EP12100 energy very efficient battery.

ExpertPower EP12100 features a built-in Battery Management System (BMS) which protects the battery from unwanted events, like overcharge, over-discharge, overheating, and similar.

Recommended charging voltage is 14.4±0.2 volts, with a maximum charging voltage of 14.8 volts.

The maximum allowed continuous discharge current is 100 Amps with 200 Amps being allowed for ~2 seconds, after which BMS disconnects the battery.

The maximum allowed continuous charge current is 50 Amps, with 20 Amps being recommended.

When the battery is fully discharged, BMS disconnects the battery at 9.6 volts to protect the battery.

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Another very important advantage of the ExpertPower EP12100 battery over similar lead-acid batteries is a large number of supported charging/discharging cycles:

- 2500 cycles down to 100% DOD,

- 3600 cycles down to 80% DOD,

- 7000 cycles down to 50% DOD,

which is 8-10x better than most of the 12V 100Ah deep cycle AGM/Gel lead-acid batteries.

Also, unlike lead-acid batteries, ExpertPower 12100 battery doesn't feature a sharp actual capacity drop with the increase of discharge current.

ExpertPower EP12100 battery can be used to make 12V battery packs (connection in parallel) or 24V battery packs (connection in series). For exact wiring diagrams check the documentation and/or contact the manufacturer directly.

 How to Charge ExpertPower EP12100 Battery?

There are several ways of charging the ExpertPower EP12100 battery, for example using solar panels with an MPPT charger that supports the charging of lithium batteries or by using a smart lithium battery charger.

Note: smart AGM battery chargers should NOT be used for charging lithium batteries, not just ExpertPower EP12100 battery unless they feature dedicated lithium battery charging mode.

ExpertPower EP12100 battery features a maximum charging voltage of 14.8 volts, recommended charging voltage of 14.2±0.2V, maximum charging current of 50A, and recommended charging current of 20A.

expertpower epc1220

ExpertPower manufactures ExpertPower EPC1220, dedicated lithium 12V 20A battery charger, which is recommended for 40-50Ah and larger lithium batteries.

ExpertPower EPC1220 features a Constant Current/Constant Voltage (CC/CV) charging algorithm and is suitable for lithium batteries of other brands as well.

Unit features physical dimensions of 6.3 x 4.1 x 2.4 inches (~16 x 10.5 x 6 cm) and it weighs 2.65 pounds (~1.2 kg).

AC cord is 3 feet (~0.91 m) long, while the DC cord is 4.5 feet (~1.37 m) long and features alligator clips.

When the ExpertPower EP12100 battery is discharged down to 50% DoD, it takes ~2.5 hours for the ExpertPower EPC1220 to fully recharge the battery.

For more reviews and recommendations, feel free to check the ExpertPower EPC1220 Lithium Battery Charger Amazon link (link opens in the new window).

Another recommended battery charger is NOCO Genius G26000, which offers more functions, but it also costs more than ExpertPower EP1220.

noco genius 26000

NOCO Genius G26000 is a versatile lead-acid and lithium battery charger that comes with a broad range of various functions, including:

- 12V lithium and various lead-acid batteries charger with up to 26 Amps,

- 16V lithium and AGM batteries charger with up to 20 Amps,

- 24V various lead-acid batteries charger with up to 13 Amps,

- 13.6V/5A max. power supply,

- 12V lead-acid batteries repair mode,

- 30Amp 5 minutes jump charger.

Note: it cannot be used to charge 24V lithium batteries.

If You have only one or perhaps just a few 12V 100Ah lithium batteries, one or two ExpertPower EP1220 battery chargers are all that You will need.

But, if You have several large(r) batteries of different chemistries that must be regularly charged, consider NOCO Genius G26000 - it is an expensive unit, but what You pay is what you get ...

For more reviews and recommendations, feel free to check the NOCO Genius G26000 Battery Charger Amazon link (link opens in the new window).

ExpertPower EP12100 Battery as an Inverter Battery

ExpertPower EP12100 battery features a maximum continuous discharge current of 100 Amps and with an output voltage of >12V, it can be used as an inverter battery for inverters up to 1200 Watts, 1000 Watts recommended.

Since most 1000 Watts power inverters feature surge power of up to 2000 Watts, it is good to know that ExpertPower EP12100 battery is able to provide up to 200 Amps for 2 seconds, which is enough to cover spikes and surges associated with starting of different tools and appliances.

For example, if the ExpertPower EP12100 battery is used to provide power for a power inverter with 80% efficiency and a continuous load of 200 Watts, that would mean:

P(battery) = 200 W / 0.8 = 250 Watts

I(battery) = 250W / 12.8V = 19.53 Amps = ~20 Amps

In this case, ExpertPower EP12100 battery is able to power 200W load for 5 hours, which is enough for TV, small fridge and similar.

Note: for actual appliance wattage, check the labels on each appliance that You have, since they can differ significantly.

expertpower ep12100 mLong Story Short: If You are looking for a lightweight, but durable deep cycle lithium battery, consider ExpertPower EP12100 battery - it can support a large number of charging/discharging cycles, it is of ultralight design, it can provide 100 Amps continuously, it is protected by the built-in BMS and it comes with a 1-year limited warranty.

Initially, lithium batteries cost more than similar lead-acid batteries, but in the long run, they actually save money, when/if cycled regularly.

For more reviews and recommendations, feel free to check the ExpertPower EP12100 Lithium Deep Cycle Battery Amazon link (link opens in the new window).

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