Note 1: in accordance with the diagram wiring 0 V, 3.7 V (B -) (B1) (B2), 11.1 V, 7.4 V (B +), dont deliberay short circuit! Note 2: after connected line need to recharge, just can have output. Note 3:3 series battery, please make sure that each set of battery voltage, if not, please separate with each set of batteries in , the battery voltage drops quickly is a bad battery. Note: dont put the good cells and in bad!Three groups of battery capacity/internal resistance as close as possible!(2 + 1 good battery, the use effect of poor battery = the use effect of three bad battery). The attribute of the lithium battery protection board: Model: HX - 3 s - 01 charging pressure range: 4.25 + / - 0.05 v to 4.35 v Size: 50 * 16 * 1.0 mm discharge voltage range: 2.3 + / - 0.05 v to 3.0 v Maximum working current: 5-6 - a working temperature: - 40 - + 50 Maximum instantaneous current: 8 a storage conditions: - 40 - + 80 Static electricity: less than 30 ua useful life: more than hours Resistance: less than 45 mo short circuit protection: to protect and restore must charge Charging voltage: 12.6 V - 13 V The protection plate size and device description;