Olympus CAMEDIA D-100 Reference Manual page 21

Do not use batteries whose exterior is not completely covered by an insulating
sheet. If such batteries are used, they may cause leakage, excessive heat, or
explosion. Some batteries are sold with a partial insulating sheet, or without
any insulating sheet at all. Do not use these batteries under any circumstances.
The following R6/AA batteries cannot be used
Batteries whose exterior is only partially
covered, or not covered at all, by an
insulating sheet.
Batteries whose œ terminals are raised, but
not covered by an insulating sheet.
Batteries whose œ terminals are flat and not
completely covered by an insulating sheet.
(Such batteries cannot be used even if the œ
terminals are partially covered.)
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PREPARATION