06-28-2026, 05:29 PM
Tim, the real issue with misuse of Lithium batterys is not building the system to the application of Lithium battery. Lithium discharges at a much flatter voltage curve when compared to Lead Acid,
so most Low Voltage warning lights come on at 12.7 showing the Alternator is not charging. Lead acid natural resting voltage is about 12.4-12.6
Lithium resting voltage is 12.8-13.2 roughly. i could be off slightly.
a lithium resting at 100% voltage will show 13.2 and lead acid will show 12.6
a lithium at 20% will show 12.8 and lead acid will show about 8-9volts.
many people use an external voltage regulator such as the B&C LR3E which can be adjusted by the B&C guys to show a Low Voltage warning at 13.5 indicating the Lithium Battery is not being charged. otherwise they come on at 12.7 for normal applications.
![[Image: IMG-2331.jpg]](https://i.ibb.co/CK9r3KQg/IMG-2331.jpg)
so most Low Voltage warning lights come on at 12.7 showing the Alternator is not charging. Lead acid natural resting voltage is about 12.4-12.6
Lithium resting voltage is 12.8-13.2 roughly. i could be off slightly.
a lithium resting at 100% voltage will show 13.2 and lead acid will show 12.6
a lithium at 20% will show 12.8 and lead acid will show about 8-9volts.
many people use an external voltage regulator such as the B&C LR3E which can be adjusted by the B&C guys to show a Low Voltage warning at 13.5 indicating the Lithium Battery is not being charged. otherwise they come on at 12.7 for normal applications.