I don't know about everyone else, but I've used Flashme Stealth on my dsl and I have noticed a markedly lower battery life. With my usage, pre-flashme I usually have to recharge it once a week. After using flashme stealth, I need to charge it every 3 days. Of course, I have Brain Age in the ds slot for sleep mode, but I leave my sclite in my gba slot when I put it to sleep