iMac battery replacement Replacement Lithium battery cell for most Macintosh computers (please check size before ordering). For most Macs, the battery fitting is obvious but, if you need fitting instructions for a pre-2001 Mac model (not iMac), please email Technical with the exact model description. 1/2 AA size order code F206-520 price £7.95 Disconnect mains power to computer after shutting down. Follow instructions in your User Manual to access main board. Discharge body static by touching metal frame of computer. Remove plastic clip that covers battery on main board. Lift out old battery; note position of "+" end. Fit new battery observing polarity. Replace clip and reassemble computer. OLDER iMac INSTRUCTIONS: