Here is an example battery charging voltage as a function of temperature; for flooded lead acid. Gel and AGM slightly different (Lifeline spec is 14.72V at 50 deg F).
| Temperature F/C | Absorption Voltage |
| 122/50 | 13.80 |
| 104/40 | 13.98 |
| 86/30 | 14.19 |
| 77/25 | 14.34 |
| 68/20 | 14.49 |
| 50/10 | 14.82 |
| 32/0 | 15.24 |
| 14/(-10) | 15.90 |
| (-4)/(-20) | 17.82 |
This time of year, here in the NW, frequently at 40 deg F, I want absorption voltage around 15V when the battery is cold. During charging I think there will be some rise internally in the battery so the voltage would become lower a bit as the battery is charged, where the ambient temp typically remained the same.
John Acord __._,_.___
Posted by: John Acord <jcacord@gmail.com>
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