Made to order. Production time: 1.5–2 weeks.

Advance payment: 3,000 UAH.

ATTENTION! When buying a "New", assembled Chinese battery, most likely you are buying a battery with used cells...

The battery will be fitted with new EVE MB31 cells with a production date of 2 to 6 months from the current date.

LiFePo4 battery 12V/314Ah/4000Wh/BMS 300A

The number of charge-discharge cycles is 8000 cycles.

The battery is built on the basis of 4 EVE MB31 Lifepo4 3.2V 314Ah cells, which are the best in quality on the market in this form factor.

The cells are new, have "GRADE A". Production date - June 2025. Confirmation of quality is also factory-welded terminals on 4 m6 bolts, and red and black dots, indicating the quality control of laser welding at the EVE Energy production.

This battery is controlled by the best on the market (in this segment) BMS JK-B2A8S30P-HC. This BMS provides full cell protection and active balancing with a current of 2A. B2A8S30P-HC allows you to charge and discharge the battery with a current of up to 300A (the charge/discharge current recommended by the cell manufacturer is up to 157A). BMS also has the ability to connect via Bluetooth to view or change battery settings.

BMS passwords:

1234 – first connection of the device via Bluetooth

123456 – unlocking changes to settings in the application

You can install the application via QR on the case.

The battery has the ability to self-heat and does not allow charging to start until the cells reach a certain (set in the settings) temperature. That is, if you connect the charger at the “protection” temperature, the current will not go to charge, but to heat the cells. The heating current is about 3 A, which is not much and the main condition for heating in this case is that there must be VERY GOOD INSULATION of the battery case. The insulation must be made of heat-insulating material with a thickness of 5 cm. without air gaps. When a certain temperature is reached, the heating is turned off and charging begins. ATTENTION!!! NOT ALLOWABLE!!! Use an insulated battery in the warm season, or in a heated room.

The concept when assembling this battery was exclusively QUALITY and MAXIMUM RESOURCE.

To improve all contacts, 2 types of contact pastes were used:

IDEAL NOALOX (USA) - Zinc-based paste for aluminum connections, used for contact with cell terminals.

ElCont-N (UA) - Copper-based contact paste, used for other contacts and threads.

The aluminum jumpers that come with the cells are replaced with flexible copper ones. Stainless steel bolts are replaced with brass ones. Only all terminals are soldered. Thanks to this approach, the internal resistance of the assembly on the ring terminals (not on the cell terminals) is only 1 mOhm, which is an excellent result! The absence of aluminum and steel, flexible copper buses and soldering - significantly reduce the possibility of corrosion of conductive elements and the impact of vibration, which allows this battery to be used in automobile and water transport. The case of this battery is sealed. Also, the BMS with a peak current of 450A will be able to start the engine of almost any car without problems if necessary.

How long will this 100% charged battery last when used in a power-off apartment?

An average refrigerator, an average TV, a laptop or an average computer in non-gaming mode, LED lighting, a heating boiler, a router - all this can work from this battery for up to 10 hours.

To work on the network,you need to purchase a 12V-220V inverter separately.

How does this battery differ from other “factory” batteries?

Any factory production seeks to reduce costs in order to increase revenue. Given that the absolute majority of “factory” assemblies are made in China, there is maximum savings and very often deception. In most cases, to give “significance”, a case is used that is 50-100% larger than necessary for the components. The empty space is either filled with foam or sealed with sealants. BMS is not of the best quality. Cells are very often “GRADE A”, or even B/W. Even well-known brands try to save money and one or more of the above shortcomings can be found there too.

Our battery was built without savings, which you can verify by opening and checking it.

The battery can be equipped with a 100A or 120A charger for an additional fee.

Brass bolts are included:

Short - for ring terminals

Long - for crocodile clips

The battery has a color display showing voltage and current capacity in percent, as well as a battery on/off button.

Battery size 345x245x190 mm

Weight 27 kg.

After assembly, the battery is tested for 5-10 hours in charge/discharge mode.