Canon MARK III EOS-1 DS Instruction Manual page 22

Nomenclature
Battery Pack LP-E4
Handle end
Battery Charger LC-E4
Charger for Battery Pack LP-E4. (p.26)
Battery pack slot
Power cord socket
22
Battery release handle
Charge level/Calibration (Discharge) status indicator/
Protective
covers (2)
Lock lever
Contact end
Performance check lamp
Charge lamp
Calibration/Performance
check button
Car battery cable socket
Power cord
Contacts
Protective cover