A warning of sorts: these batteries come with some pretty hefty warnings concerning toxicity and explosion - probably a good idea not to think of them as AA batteries you played with as a kid - and do take the effort not to short-circuit them while you assemble your new pack.
The Naomi DIMM has a 3 wire battery pack consisting of small PCB and 2 x Panasonic CGR18650H cells. The H is probably some rating, I used CGR18650CF's which have a bit better capacity. Search for CGR18650, or just 18650 and you should be able to source some locally.
The pack is connected like this:
Open the DIMM and disconnect the battery pack:
Strip off the outer plastic, and you should end up with this:
Desolder the PCB, be careful not to short the battery:
Assemble the new cells with the cell spacer and some electricians tape. Solder the metal part from the old battery pack to the new cells.
Add some more tape:
Solder jumper wires to B-, B+, and BC.
Tape it up, and you're done:
Thanks to InvZim of KC for this :smt007
Naomi DIMM battery replacement
I know this may have been thought of, but is it possible to use a AA holder? and just solder it to the connections instead of using tape? then you could replace the purple batterys alot easier, just pop off the holder door and replace them with no complex soldering. (Correct me if they are too short/long, because they seem fine from looks.)
dimm batterys
hi
when i search 18650 they are all 3.7 volts
on the sega battery it says 7.2 volts
any ideas?
when i search 18650 they are all 3.7 volts
on the sega battery it says 7.2 volts
any ideas?