This Wasabi Power dual battery charger replaces the Nikon MH-26aAK Adapter Kit. It includes one dual battery charger for the Nikon EN-EL18, EN-EL18a, EN-EL18b, EN-EL18c. It also includes one adapter each for the Canon LPE4, LPE4N. 

The MH-26a charges and calibrates the EN-EL18, EN-EL18a, EN-EL18b, EN-EL18c Li-Ion batteries for the D4 and D4S cameras, and MB-D12 battery pack. The adapter attaches to one of the slots on the MH-26a and charges the LP-E4/LP-E4N for the Canon EOS 1D series. 

Nikon EN-EL18, EN-EL18a, EN-EL18b, EN-EL18c, MB-D12 (dual charger) compatible with: 

Nikon D4 

Nikon D4S 

Nikon D5 

Nikon D6

Canon LP-E4, LP-E4N, LP-E19 (1 adapter included) compatible with: 

Canon EOS-1D C 

Canon EOS-1D Mark III 

Canon EOS-1D Mark IV 

Canon EOS-1Ds Mark III 

Canon EOS-1D X

Canon EOS-1D X Mark II

Canon EOS-1D X Mark III