Canon Batteries

[KeithH]

After buying cameras, and spare batteries over a period of years, I now have 9 Canon type batteries.
Last week I was caught out when a battery went low - ( I had a spare ).
I decided to try to 'calibrate' them, so that I would just use the 'good' ones.
I numbered each one, then discharged them slowly - I got them to power a xenon flasher, which took a few hours.
Then I noted the recharge time. 2 took 45 mins to recharge, which I suspect are the batteries on the way out.
The others took about 1hr 30 mins, which I think is a good time. The proof of the pudding etc..... will show when I next take them out for a session.
Do the electronics experts amongst you think my results are valid?

 

[gblades]

The discharge time would be a better indication. When charging you don't know what the charger is doing. If the temperature sensor in the battery is off for example then it might be charging more slowly giving a false impression the battery is better than it really is.