Today my little&cheaper charger arrived, so wanted to try it with one AA battery. Before, it was 1,180something mAh.
Start charging at 16.00 but at 20,45 it was still charging at 0,5V (it was stuck at 75% or the 3° blue led). Well, I have thinked it was too much time for a little AA, so I pull it off and with my multimeter that was the result:
It was charged with the Ikea Koppla:
I’ve expressly buy it because it work fine with AA battery, but now I’m not so sure…
Some suggestions?
If you look at HKJ’s reviews almost all NiMh charging terminate above 1.5V. The time is strange though. Have you tried charging on 1A rate?
No, I’ve charged just this cell; the charger come today. Maybe tomorrow will try with a 18650 or like usb power bank.
I know it overcharge a little, I’ve read so far, but after 4,45h it was still blinking, that was very strange. Don’t forget that the Eneloop was not so drained, it was just around 1,200/1,180… :-/
With NiMH the leds are not very useable.
After 5 hours I would expect it to be very close to termination, but it is rather undefined with NiMH. Try charging at 1A for 3 hours, then it is supposed to terminated.
With NiMH you will often see overcharge, usual it is not a big deal, but if you want the longest life from LSD cells it is best to avoid it or at least keep it at a fairly low level.
That’s right, it’s no a big deal… :-/
But I’ve buy it expressly because it seems to work fine with AA battery…I’ve a Nitecore I4 V.2 too, that with 4 fully slots work at 0,375 but I’ve never charged 4xAA for around 5h.
I’ve read that this charger (I4) is not the best for AA, so what to do???
Are you sure your dmm is accurate?
1.5V is a relatively low amount of overcharge compared to many chargers. Personally I’d try charging a more drained Eneloop on the 1A setting and check it after about 3 hours as HKJ suggested. If it’s not up around 1.51V I wouldn’t worry about it.
But that’s just me.
I say the same : Are you sure your dmm is accurate?
I would be less concerned about the voltage but more concerned about the temperature of the cell.
Was the cell excessively hot? This would be a problem that limits the NiMh cell life.
Well, it is a budget dmm…I know it’s not the top…
I have touch it a coupple of time, it was not hot. Warm, but not hot.
That’s right, but with I4 never be on high value (max 1,450 + o -)
Now I have try with a low budget nimh from a battery pack of a vacuum cleaner, discharged to 1,00mAh and at 1V in around 3 hours was fully charger at 1,460. I’ve wait 12 hour for a new control, now is 1,440. At this point must try again at 0,5V.
That’s a good sign. If you left it in the charger for 12 hours and the voltage settled it shows that the charger is terminating properly and charging stops.