I charged my PP for 12 hours initially, and it run for 2 weeks from full to two bars. I then recharged it for another 12 hours. I believed that the battery meter was not calibrated and was afraid of losing juice. Right now my PP takes 10 days average for every battery bar, with 3-4 hours reading everyday
. Remember not to let your PP dead before recharging. It creates lots of problems (at least that what I understand from the various threads in Astak forum here).