How to drain a camera battery?

Without clicks
Got a trip comming up and I want to fully drain my batteries and charge them up fresh before the trip since don't want them to die on me when I get there. However I don't think I will get a chance to do any serious shooting beforehand = so I need tips on draining my 400D batteries - without shooting and without destroying them of course

(of course doing it this way means they are probably near fully charged anyway )

 

Digital? Leave the display on, or go into bulb speed and leave the sensor charged until it can do so no more!

 

you offering to bring me fresh new batteries with you then LP
cause once they are in the Thames there is no getting them back (might get a fish for lunch though if it gets too close to the contacts!)

 

seriously?

 

I don't think these lithium batteries have a 'memory'...so you should be able to just charge them up (without draining them first) and that should be all you need to do.

 

but won't that affect their overall lifespan - one event probably won't but repeated recharging without discharge?

 

I'm not sure. I think I've read that it won't...but I think they say that about other types of rechargables and I'm pretty sure that it does (with NiMH for example).
When I recharge my AA NiMH batteries, I almost always set the charger to drain them first, then recharge. None of my lithium battery chargers have that option, so I would assume that it's not needed.

Either way, I use cheap off-brand batteries in my camera...so if it does shorten the life span, it's no big deal. I'd be more worried about using the camera to drain them, shortening the life of my cameras.

 

interseting!
least it puts me at ease about recharging the batteries!