I don't know how this might apply in the world of lighting, but my HTC Incredible retains a charge much longer when I charge it, disconnect it, then 'bump' charge it again for about ten minutes. Under normal charging circumstances, I've never had an issue with run time. When I first received the new battery (not the recall replacement, but my original replacement), I ran a test on high, and it lasted 3 hours and 28 minutes before dying out completely. This is with the charger that came from GMG.