Has anyone seen this:
EOS-1D Mark IV: battery problem alert
If you place the Canon LP-E4 battery (for the EOS-1D Mark IV) onto the LC-E4 charger to recharge the battery and all the LED lights for that battery flash green, while the CAL/CHARGE lamps flashes red, it means there is a problem with the battery. If this happens, you should remove the LP-E4 battery from the charger and take it either to a Canon Service Centre or back to your dealer.

