1D Mk II Battery

Don't think so. Designed for EOS-1v & EOS-3 film cameras. The NP-E3 has a rated capacity of 1,650mAh, higher than the previous NP-E2. If your NP-E3 won't hold a charge, first try 'reconditioning' it with the charger, might take a few cycles to reform.
These batteries are Ni-MH (Nickel Metal Hydride) and suffer the 'memory effect' if not fully discharged before recharging a few times.
If that doesn't work and we assume it's life expired, Mexxtronics do a generic equivalent for about £30.
 
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