eisman wrote:Kempiejon wrote:A few people have mentioned rechargeable batteries - for those using clones of AA or D cells it's worth noting that the rechargeables are only 1.2v compared to the disposables at 1.5 volts, the more batteries you need in the device the more pronounced the under power becomes.
I agree that the nominal output voltage for AA batteries is 1.2v. However, I have numerous rechargeable AA batteries from Aldi and/or Lidl branded 'Tronic' and 'Activ Energy' which, when fully charged, provide output of 1.35v to 1.4v. These are NiMH high capacity (2300 mAh and 2500MAh) that have been in use for some years and are regularly recharged, so will doubtless have lost some capacity (whether this affects output voltage I do not know).
I have no experience of rechargeable D batteries, but I have some Ansmann NiMH rechargeable C batteries (3500MAh) which provide similar output of 1.35v to 1.4v when fully charged.
Yes, certainly off-load (i.e. measuring with high impedance voltmeter)
But have a look at the last graph here.
https://www.powerstream.com/AA-tests.htm
You can see that 1.2V nominal is a good rule of thumb