Originally posted by bertschb
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Yes. I believe (correct me if I'm wrong) Battle Born has two different temperature limits. One low limit for charging and one for discharging where the battery will eventually turn off. This is ok if folks want to allow this to happen. I believe its best to not rely on the BMS but to control these parameters ourselves. We can use the BMS as a redundant system or in the case of freezing, just do not do it. Its best to taper the charge at various low temperatures which no BMS currently controls for drop in batteries. My point is I do not need an on/off switch for this function. Now the overcurrent, overvoltage, overtemp and low SOC limits are critically important. Take a look at the Trojan manual where they provide a charge versus temperature scale for best battery life. This is the best explanation in how a lithium battery should be handled at low temps. So we can heat them, or move them inside and battery life will be maximized since our chargers do not base the charge profile by battery temperature. Basically, these batteries like conditions very close to ourselves where heat (another issue) will also shorten battery life as well as lingering at the high/low limits of SOC.
With the Victron BMV712 I can keep track of my battery and disconnect it when on AC or control the high low limits through the alarm settings when on the battery. This is the latest toy added to the toy box.
Jim
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