Lithium battery protection board properties:

Model: HX - 2 s - A2 of charging voltage range: 4.25 + / - 0.05 v to 4.35 vSize: 17.5 * 17.5 * 17.5 mm discharge voltage range: 2.5 + / - 0.05 v to 3.0 v
Maximum working current: 5 a working temperature: - 40 - + 50 °
Maximum instantaneous current: 7 a storage conditions: - 40 - + 80 °
Static electricity: less than 10 ua useful life: more than 50000 hours
Resistance: less than 300 m Ω short circuit protection: to protect and restore must charge
Charging voltage: 8.4 V - 9 V
 

Welding point:

B. + connect battery anode;
B. - connect battery cathode;
MB, connect battery 1 and 2 before the join points;
P. + correct answer the charge/discharge (charging/discharging end sharing); 
P. - answer the charge/discharge end negative (charging/discharging end sharing).