Deep Cycle Marine Battery

Ampere Time 12V 300Ah Lithium Iron Phosphate LiFePO4 Deep Cycle Battery

Ampere Time 12V 300Ah Lithium Iron Phosphate LiFePO4 Deep Cycle Battery is a large and surprisingly lightweight deep cycle LiFePO4 battery, being able to provide very constant output voltage, with the maximum continuous output power of ~2.5 kW.

Thanks to the advanced BMS, it can be connected in parallel and series (up to 4 batteries in parallel/series), creating battery packs with even larger capacity and voltages up to 48 volts.

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Ampere Time 12V 300Ah LiFePO4 Battery Features and Specifications

Ampere Time 12V 300Ah LiFePO4 battery features physical dimensions of (L x W x H) 20.5 x 9.37 x 8.54 inches (~52.1 x 23.8 x 21.7 cm) and although it is very often classified as BCI Group 4D battery, it is actually BCI Group 6D battery:

- BCI Group 4D: 20.75 x 8.75 x 9.875 inches (52.7 x 22.2 x 25.0 cm),

- BCI Group 6D: 20.75 x 10 x 10.25 inches (52.7 x 25.4 x 26.0),

- BCI Group 8D: 20.75 x 11.125 x 9.875 inches (52.7 x 28.3 x 25.0 mm).

Whenever looking for a new battery, not just Ampere Time 12V 300Ah LiFePO4, always check the actual size of the battery compartment and the actual size of the battery - better safe than sorry.

Despite its size, the Ampere Time 12V 300Ah LiFePO4 battery weighs only 69 pounds (~31.3 kg), which is surprisingly lightweight for the 12V battery featuring 300 Ah capacity.

Ampere Time 12V 300Ah LiFePO4 battery comes with the built-in Battery Management System (BMS) that protects the battery from unwanted events like overcharge, over-discharge, too low and too high temperatures, overcurrent, short circuit, etc.

The nominal voltage of the Ampere Time 12V 300Ah LiFePO4 battery is 12.8 volts and the nominal capacity is 300Ah - however, the manufacturer doesn't state the actual discharge rate for achieving 300Ah capacity, but since this is a LiFePO4 battery, supported discharge rates are higher than the discharge rates of similar AGM/Gel-Cell batteries.

Thanks to the built-in Battery Management System, Ampere Time 12V 300Ah lithium battery is able to provide 200 Amps continuously and 400 Amps for 5 seconds. Also, its maximum allowed charging current is also 200 Amps, ensuring quick recharge if needed.

If a battery pack with larger capacity and/or voltage is required, Ampere Time 12V 300Ah lithium battery can be connected in series/parallel (up to 4 batteries) - first, recharge them separately using smart lithium battery CC/CV charger and after that connect them all 4 in parallel for at least 12 hours to normalize/equalize themselves. After that, build your battery pack as intended.

Note: for exact procedures, check the battery's Owner's Guide, and if needed contact Ampere Time Support.

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Ampere Time 12V 300Ah battery comes with a pair of carrying handles, allowing two adults to carry the battery to shorter distances.

The battery features a pair of M8 terminal ports, ensuring a firm connection between the battery and cables.

Another advantage of Lithium Iron Phosphate chemistry is the number of supported deep discharge cycles - Ampere Time 12V 300Ah battery supports 4000-8000 charging/discharging cycles depending on the DoD% (Depth of Discharge percentage) and features an estimated 10-year lifespan, with a 5-year warranty.

How to Charge Ampere Time 12V 300Ah LiFePO4 Battery?

Ampere Time 12V 300Ah lithium battery support charging current up to 200 Amps, however, in order not to overstress the battery, one should keep the charging current under 60-70 Amps. IMHO, of course.

Any form of charging/chargers that supports charging of the lithium batteries is supported, including advanced lithium battery chargers, solar charging controllers, and similar - just be sure that the charger/controller is intended for lithium batteries with the maximum charging voltage in the 14.2 - 14.6 volts range.

noco genius g26000 w300For example, NOCO Genius G26000 26-Amp 12V/24V Smart Battery Charger can charge 12V lithium batteries with currents up to 26 Amps - if the Ampere Time 12V 300Ah battery is fully discharged, NOCO Genius G26000 can recharge this battery in 12-13 hours.

NOCO Genius G26000 is a rather versatile battery charger that comes with several operating modes, including:

- 12V battery (26 Amps): lead-acid, lithium,

- 16V battery (19.5 Amps): lead-acid, lithium,

- 24V battery (13 Amps): lead-acid,

- 13.6V (5 Amps): power supply mode,

- 12V (1.5 Amps): repair mode,

- 12V (30 Amps, 5 minutes): JumpCharge.

For more reviews and recommendations, feel free to check the NOCO Genius G26000 26-Amp 12V/24V Smart Battery Charger Amazon link (link opens in the new window).

If You plan on connecting two or more Ampere Time batteries in series in order to create a 24, 36, or 48-volt battery pack, consider getting a good lithium 24, 36, or 48-volt industrial battery charger - these units are not cheap, but neither are the batteries they are charging.

For example, NOCO offers several industrial battery chargers that can be used for this purpose:

Model NOCO Genius GX2440 NOCO Genius GX3626 NOCO Genius GX4820
Photo noco gx2440 noco gx3626 noco gx4820
Input Voltage 100-240V 100-240V 100-240V 
Output Voltage 24V 36V 48V
 Maximum Charging Current  40 Amps  26 Amps  20 Amps
Chemistries Supported  Lead-acid, lithium Lead-acid, lithium  Lead-acid, lithium 
Batteries Supported Up to 425 Ah Up to 425 Ah Up to 425 Ah 
Amazon Link NOCO Genius GX2440 NOCO Genius GX3626 NOCO Genius GX4820

Note: Amazon affiliate links open in the new windows, feel free to check them for the most up-to-date offers and prices.

Of course, other manufacturers also offer rather reliable and durable battery chargers, so choose according to your personal needs and preferences.

Solar charge controllers that support the charging of the lithium batteries and at least 800 watts of solar panels can be used to recharge Ampere Time 12V 300Ah battery during the day, even if the weather conditions are not ideal.

For example, 800 W solar panels with an efficiency of 60% (clouds, angle of panels, etc.) can recharge a fully discharged Ampere Time 12V 300Ah battery in 10-11 hours.

Since this battery can accept up to 200 Amps continuously, a larger solar panel with a good lithium battery charge controller can recharge even a 12V 300Ah battery in just a few hours.

Ampere Time 12V 300Ah LiFePO4 Battery as a Trolling Motor Battery

Ampere Time 12V 300Ah LiFePO4 battery can be used as an excellent trolling motor battery.

With an RC value of ~720 minutes (12 hours), the Ampere Time 12V 300Ah LiFePO4 battery can provide 25 Amps for 12 hours or 50 Amps for 6 hours, with the voltage most of the time being 12.8 volts, or at least higher than 12 volts.

Note: many trolling motors come with the battery charge monitors calibrated for lead-acid batteries - they should not be used for monitoring the remaining charge of the lithium batteries.

If the size of the battery is not an issue, the Ampere Time 12V 300Ah LiFePO4 battery can be used as trolling motor battery even for larger kayaks and smaller pontoon and inflatable boats.

The battery weighs just 69 pounds (31.3 kg), which is ~4.35 Ah/pound (~9.6 Ah/kg) - equivalent AGM/Gel-Cell batteries are much heavier, for example, VMAXTANKS XTR8D-350 (Amazon link, opens in the new window) is an excellent deep cycle Group 4D/8D AGM battery featuring 12V 350Ah and RC value of 780 minutes, but it weighs 185 lbs (83.8 kg), which is 1.76 Ah/pound (3.88 Ah/kg) when being discharged at 25 Amps rate.

Ampere Time 12V 300Ah LiFePO4 Battery as a Power Inverter Battery

One of the intended uses of the Ampere Time 12V 300Ah LiFePO4 battery is for off-the-grid applications, where it can cycle on a daily basis for a long time.

As an inverter battery, the Ampere Time 12V 300Ah battery supports the power inverters up to ~2500 W of running power and up to ~5000 W of starting power.

However, these levels of power require strong currents (200/400 Amps) and cables for a 12V system.

Personally, if You need continuously 1-2 kW of electric power, consider shifting your system from 12V to 24V - this will reduce the currents and decrease the energy losses.

But, strictly speaking, an Ampere Time 12V 300Ah battery can power even such 12V systems easily.

For example, if the battery is connected to a 2000W pure sine inverter that operates at 85% efficiency and provides 500W of power, then the battery can operate up to 5-6 hours, depending on the battery's initial charge and its general condition.


Long Story Short: Ampere Time 12V 300Ah battery is a large, but lightweight lithium battery that can be used as a trolling motor battery, as an inverter battery, a solar battery, and for many other uses.

It can provide up to 200A continuously and up to 400A for 5 seconds and thanks to the advanced BMS it can be even connected in parallel and series (up to 4 batteries).

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Initially, the Ampere Time 12V 300Ah battery is anything but a cheap battery, but thanks to a large number of supported charging/discharging cycles (4000+ cycles), in the long run, it is cheaper even than the lead-acid batteries.

For the most up-to-date offers and prices, feel free to check the Ampere Time 12V 300Ah Battery Amazon link (link opens in the new window).



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