Editing Talk:Battery firmware lockout (section)

==== Safety cutout voltage ====
Commonly referred as "Do not charge" voltage, this voltage is where chemical decomposition occurs and it's no longer safe to charge due to elevated risks. 

This is an '''open circuit voltage'''. If you somehow discharge the battery to this voltage but it bounced back to above discharge cut-off voltage after switching off the device, it's still safe to use, but don't do this intentionally, the gain is not worth the cost. If it bounces back to between these two voltages, see below.

The voltage between the safety cutout voltage and discharge cut-off voltage is the "pre-charge" range, where a very low charging current is applied to safely bring the battery pack back to normal.

A common "self destructive design" is to program the BMS "Permanent Fail" low voltage to way higher than the battery's safety cutout voltage. If the voltage is set to as high as the discharge cut-off voltage, the battery may brick itself if a large instantaneous load is applied(common on power tools) while the battery is at low charge.