hmm... first of all... thx for the answeres.... would it help when i plug in an charger to support battery (and maybe prevent voltage drop)?? i am 5 days in the wood with the austrian army... i think best would be not to reboot my n900.... but what when i have to reboot?? i ve 2 full charged batteries ... and a raikko Accupack 5200.... thats an 5200 mAh battery i use as an charger.... is it bettter to charge often an not so long.... or should i let the battery run out every time.??