Prerequisites: - A jailbroken iPhone in IOS 3.x - a way to connect the command line (ssh or console) - the installation of "IOKit" from Cydia Just type the following command (one line) : ioreg -w0 -p IOPower -c ApplePCF50635PMUPowerSource -n ApplePCF50635PMUPowerSource -r | grep CurrentCapacity This show, for example: "CurrentCapacity" = 95 or 95% charge for the battery ....