On 12/11/2020 13:57:38, Ian Jackson wrote:
In message , Chris Green
writes
Martin Brown wrote:

I have never seen a battery whose voltage increased significantly with
use as its remaining capacity decreased. YMMV
(but I expect that it doesn't)

Rechargeables can increase their voltage when discharging, I have a
discharge tester that shows voltage, current and capacity as it runs
and you often see a (small) increase in voltage at the beginning of
the discharge cycle.

If this happens, why? If has cooled down after charging, possibly the
effect of warming up a little?

The reduced voltage is a consequence of temperature increase and the
corresponding reduction of terminal voltage. It is often used to
determine the charge end point.

https://batteryuniversity.com/learn/...ased_batteries

I can only assume the increase you're seeing is from the battery cooling
down in the initial discharge?