Burgerman wrote:No charger can auto detect.
You need a charger than can do gel properly then any half decent marine charger SHOULD do 14v or 14.1V CV stage, etc.
https://www.batterystuff.com/files/pronauticp.pdf eg...
User Selectable Battery Types from above link:
Flooded 14.8 VDC 13.6 VDC
14.7 VDC 13.4 VDC
Sealed 14.4 VDC 13.6 VDC
14.6 VDC 13.4 VDC
AGM 14.4 VDC 13.4 VDC
14.6 VDC 13.7 VDC
GEL 14.0 VDC 13.7 VDC
14.4 VDC 13.8 VDC
LiFePO4 - Lithium 14.8 VDC 14.4 VDC
14.6 VDC 14.4 VDC
Calcium/Custom Programmable Programmable
VDC* default VDC* default
15.1 VDC 13.6 VDC
13.6 VDC 13.6 VDC
Equalization 15.5 VDC 15.5 VDC
If you charge a gel battery with a typical 14.4V universal charger (as supplied by many powerchair manufacturers) you are charging at .4V too high. And lose around 35% of the cycle life. Worse, this assumes 20C max, but most batteries are charged directly after use, and on a 30C summer day the battery may be at 35C. So you should be at 13.8V absolute max... So you lose 60% of the battery life! And thats what everyone uses!
Thats the one. Perfect, thanks BM.