Best Way to charge the 7D's Battery pack.

The manual on p.24 says "After recharging the battery, detach it and unplug the power cord or prongs from the power outlet."
Is it OK to leave the battery on the charger for 8 hours, after it has reached full charge?


If one is leaving for a trip early tomorrow can one put the battery on charge last thing at night say at 11.00pm and leave it on all night, and detached just before leaving in the morning at 8.00 am or should one remove the battery from the charger as soon as it indicates its had a full charge.

If not in this case It would mean starting the charge at say 8.30pm to finish at 11.00pm.

I've never had an issue doing what you suggest. Put it in charger at bedtime and take it out in the morning, or leave it in charger all day while at work.

Submariner wrote in post #14616841
The manual on p.24 says "After recharging the battery, detach it and unplug the power cord or prongs from the power outlet."
Is it OK to leave the battery on the charger for 8 hours, after it has reached full charge?


If one is leaving for a trip early tomorrow can one put the battery on charge last thing at night say at 11.00pm and leave it on all night, and detached just before leaving in the morning at 8.00 am or should one remove the battery from the charger as soon as it indicates its had a full charge.

If not in this case It would mean starting the charge at say 8.30pm to finish at 11.00pm.

Rightly or wrongly, I've left several varieties of rechargable batteries in their chargers over night, and I've been following this procedure for many years...I've never noticed any ill effects.

Thanks guys for the advice - probably is not the best way to look after a battery's longevity but the only practical way around it.

That's exactly how I charge mine. I put the charger in the outlet right next to my alarm clock when going to bed. In the morning when I go to turn off the clock I see a green light next door on my battery charger.

I don't think any of my batteries has ever taken more than a couple of hours to recharge, I wouldn't have thought that leaving it connected was a good idea.

Usually nothing happens if you leave the charger running during the night, but they add such text just incase something would happen such as a powerspike or sudden battery malfunction which 'could' cause a problem of some sort. They inform their customers so that any customers that had accidents happen because they left batteries in the charger during the night can't sue the manufacturer for loss because of fire or something else.

Better be safe than sorry, that seems to be what the manufacturers think and it makes sense.

/ Magnus

Isn't there a chip in the charger and battery that turns off the current flow once the battery is sufficiently charged?

imsellingmyfoot wrote in post #14617642
Isn't there a chip in the charger and battery that turns off the current flow once the battery is sufficiently charged?

That's what it should do. I'll be charging batteries this weekend and I will hook up the meter and see

There definatley is the battery starts to cool when its charged which shows its stoped charging

I dont think the charger for Rebel batteries is intelligent though

Well guys I did what you suggested, left it on overnight. Just before going to bed the charger was one blink per second and sort of warm. In the morning it was fully charged [obviously] and both battery and charger were stone cold. So I'm happy it turned itself off when it reached full charge.

I think the comment above of maunfacturers covering themselves against a legal claim in case of a malfuntion is on the button.

Anyway rightly or wrongly thats how these batteries will be treated until I start getting premature failures. At the end of the day they are a tool. And it's not a killer at £50 if one has to be replaced.

The chip in the battery is there to tell the camera how charged it is, but also to tell the charger when to stop charging. I wouldn't worry the only possible problem wouldbe a power surge overnight, which could screw the circuits but is most unlikely.

Came in a bit late, but yes I also noticed that after they complete a charge they stop taking a charge and begin to cool down as they are in a storage mode at that point.