Batteries
These seem like such a good idea, so I bought some with a charger. But they self discharge like crazy, 30 days and they are dead. then I saw some Duracell precharged rechargable AA cells so I tried those and they keep! Six months now in my GPS without recharging. The ones in my camera get more use and they have just been recharged for the first time since August. They cost about 5x what conventional cells cost.
The speedlight/flash on my camera uses 4 AA batts I tried the rechargeable ones but they don't have the oomph to recover quickly. Regular alkaline batts work far better than any of the rechargeable batteries I've tried, at least in a flash. More often than not I just use Lithium AA's and buy them in bulk at Sam's Club. They recover the fastest flash to flash and last about four times as long as any other AA battery I've tried including the rechargeables.
You are right about the self discharge and it is a royal PITA. I tried some pre-charged Duracells in my flash but they did not have the power to recover quick enough. For a GPS or point & shoot they would be perfect though.
All my safety equipment, strobes etc. runs Lithuim batteries. I also run them in my headlamp for night ascents when winter mountaineering as they are not as affected by cold.
Which Duracells were they? I wonder if they are the same ones I have?