The auto self-heating function will be activated by the BMS when the battery is connected to a charger at -20℃ to 5℃ (-4℉ to 41℉). The heating will be automatically activated once the charging temperature drops below 0°C(32°F). It will stop when the battery temperature reaches 5℃ (41℉).

These two series primarily address the charging issues of LiFePO4 lithium batteries in cold weather. The main difference between the Low-Temperature series and the Self-Heating series lies in the presence of an automatic Battery Management System (BMS) heating module. The Self-Heating series allows the battery to self-warm without any action required from the user while charging. However, the Low-Temperature Protection series like LiTime 12V 100Ah TM & LiTime 12V 230Ah will automatically cut-off the charging when the temperature is below 0℃ (32℉), and it requires you to take some measures, such as placing the battery in a warm indoor environment, to warm it up to 5℃ (41℉) and restore charging capability. Read on LiTime Low-Temperature Batteries VS Self-Heating Series for more information.

Yes. The LiTime 12V 200Ah self-heating LiFePO4 lithium battery can discharge if it has power while heating. However, we don't recommend discharging during the heating process, as it may harm the performance and lifespan of the battery.

External heating only heats the casing and does not heat the battery cells. In conditions of -20°C, after external heating for two hours, the battery cells temperature rise to 5°C, but the lead-acid casing temperature has risen to 70-80°C.

Therefore, it is not recommended to externally heat the battery, as the actual cell temperature cannot be determined at this time.

No. LiTime LiFePO4 lithium batteries are not intended to be used as starting batteries but energy storage, please do not use them to start any devices.  Read on deep cycle vs starting batteries to learn more.

Yes, you can charge LiTime LiFePO4 lithium batteries with solar panels. You should size your charge controller based on the voltage and current output of your solar array setup. That will ensure that your charge controller can process and regulate the power coming from your solar panels. Take a 24V MAX. 22 amps output solar system for example. You would need a solar charge controller that can handle 24 volts and 27.5 amps (125% of your max current output). Besides solar panels, there are 2 more ways to charge. Suggest reading: 3 reliable ways to charge LiFePO4 lithium batteries

LiFePO4 lithium battery charging temperature range is 0℃ to 50℃ / 32℉ to 122℉, charging LiFePO4 battery under freezing point would damage the battery cell. So it's not recommended to charge in cold weather.

If you live in the area where winter is long, it's recommended to use the battery with low-temperature protection or self-heating sereis.

It is recommended to store LiTime LiFePO4 batteries at 50% state of charge (SOC). If the batteries are stored for long periods, cycle the batteries at least every 6 months. Recommended storage environment: 10℃～35℃ (50℉～95℉), 45%RH～75％RH