Hailong HL12120 LiFePO4 12ah Battery Test and Review

While I do not sponsor this battery, I do gain a small portion of the sale if you use this affiliate Link on Amazon.com: https://amzn.to/383ZbDD

This is *not* a sponsored review. I purchased the battery to use as a backup power source for a 12v water pump.

I was a bit alarmed when I opened the box and discovered a complete lack of documentation, as in... only warnings. Details missing about internal circuitry, Battery Management System (BMS) cutouts, and spec sheet. Without knowing the BMS settings, you should not trust in it to save your battery from critical failure.

Battery performs as a LiFePO4 battery should - when it is attached to a proper charge controller.

Overall, I can not recommend this battery simply because so little is known about its internal circuitry. The Amazon page states it can support a 60 amp draw. That's a 5C draw!! Even large batteries rarely handle a 5C current. How could this battery perform such a feat through its BMS without bursting into flame? And if a 5C draw is permissible, at what point does the BMS short-circuit cut-off kick in?

The Amazon page creates a lot of questions, and the documentation supplied with the battery fails to answer the questions. Until we see a spec sheet, we have no idea what we are actually dealing with.

So, until we know more, the safest way to handle the battery is to stick to the .2C rule. You've got a 12ah battery, so keep normal charge/discharge rates down to about 2.4 amps. Keep your max volts at about 14.4 and never let the battery drop below 11 volts. The sweet spot for LiFePO4 batteries is actually between 12.9 volts and 13.2 volts - It will nearly double the life of your battery.

I bought the battery because it was inexpensive. I intend to continue to use the battery and perhaps I will some day review it again in a more favorable light, but at the current time I do not recommend this battery due to the missing documentation.