* The Best Utility tool for monitoring pbq LiFePo4 battery. * Event recorder and notification reminder, easily to manage the battery. * The phone required bluetooth 4.0 with BLE(bluetooth low energy) functions. * Cellphone Android system version 4.3+. * Measuring distance: <= 5m. * Due to the bluetooth hardware feature, the APP only can connect with one battery each time. * If you want to connect this battery with another mobile phone,pls exit this program. * As the Android system openness,diff