One of my LP-E6 batteries comes up with an error message that it communicates irregularly with my 5DIii but it still works fine. It charges correctly on my old charger supplied with the 5DIII a year ago. Today, I tried to charge it with the more recent apparently identical charger supplied with the 70D. It doesn't charge but the charger goes into a rapid red flashing mode. It looks as if Canon has nobbled it's more recent chargers so as not to work with some 3rd party LP-E6s, and my LP-E6 is not recognised as Canon.
5D III, EOS-M, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 24-105, 15-85, 100-400 II, Sigma 10-20, EOS-M, 18-55, f/2 22.