Massager battery pack, LED lamp backup power supply, 12V electronics, solar street light battery pack, monitoring standby power, and other products.Note: For products discharged above 3A, the battery discharge rate should be 3C or more.Magnification formula: 1C rate battery, 2000 capacity equal to 2AH*1=2A operating current.3C rate battery, 2000 capacity equal to 2AH*3=6A operating current.In use, the battery will heat up and the battery power is not applicable. This condition cannot be used for a long time and the battery will be damaged quickly.Test Point Description: S1 S2 short circuit P + P- will output voltage, indicating that all MOS protection is normal, plus a normally open temperature detection can expand the temperature protection.Note 1: Connect 0V (B-), 3.7V (B1), 7.4V (), and 11.1V (B+) exactly as shown. Do not intentionally short-circuit Note 2: After the cable is connected, it needs to be charged before output.Note 3: When connecting 3 batteries in series, please make sure that the voltage of each battery is the same. If not, please fill each battery separately and use it in series. In the discharge test, the battery with the fastest voltage drop is the bad battery.Explain: Don't mix good batteries and bad batteries together The capacity/internal resistance of the 3 batteries should be as close as possible (2 good batteries + 1 bad battery use effect = 3 bad battery use results).The lithium battery protection board properties:Model: HX-3S-FL25A-AOver charge voltage range: 4.25-4.35v0.05vOver discharge voltage range: 2.3-3.0v0.05vMaximum operating current: 20-25A (note heat dissipation)Working temperature:-40---+50CUpper limit instantaneous current: 35-40AStorage condition: -40-- +80CQuiescent current: less than 30uAEffective life: more than 30000 hoursInternal resistance: less than 100mShort-circuit protection: protection, delay self-recovery.Balance current: 45 mACharging voltage: 12.6V-13VMaterial: plasticcolour: greenPackage Contents:6 x Li-ion 18650 BMS Battery Protection BoardOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.