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Many thanks for the reply. Any thoughts on the brand of battery? Sony vs Panasonic?The same kind that's in there already? It's a 2450 button cell battery. You can buy the whole kit, which comes with a new retainer and o-ring, for about $30 at various dive shops and online and do it yourself. Or, you can risk not replacing the o-ring and just replace the battery for about $5. If you go the cheaper route, make sure you take a good look at the o-ring that you aren't replacing and make sure it is in good condition and then be very careful about how you put it back in. You don't want to blow it flooding a $300 computer because you saved $25.
Many thanks for the reply. Any thoughts on the brand of battery? Sony vs Panasonic?