I charge my 5d3 batteries in my 7d charger...
Interesting indeed ... I am not sure if it has anything to do with it being an American power compatible charger or if it is the charger itself ... I'm waiting for a friend of mine to come back from his holidays to test if his 5D MK III charger (also bought from USA) does the same thing.
Hmm, that's interesting...
I have the same problem, battery drains within 4 or 5 days without any use ... But this only happens if I charge the battery with the charger that came with 5D MK III which is meant for USA switches (I bought my 5D MK III from USA but I love in Middle East) ... but when I use the old 60D charger to charge the battery than there is no problem.
Well that's interesting. Do the new ones trickle charge after the green light comes on? Or maybe just stopping early? Neuro, come edumacate us on the inner workings of the Canon chargers, past and present!
... and I charge it with 60D charger now
5D MK III, 16-35/2.8 L II, 24-70/2.8 VC, 24-105/4 L IS, 70-200/2.8 L IS II, 100/2.8 L IS, 40/2.8, 50/1.4, 85/1.8, 150-500 OS, 600EX-RTx2, ST-E3-RT, Rokinon 24/3.5 T-S, D7100+18-300 VR, YN568EX, 055CXPRO4+468MGRC2, 190CXPRO4+322RC2, Gorillapod Focus+496RC2, CamRanger, B+W filters, Konova K3/31.5 etc