2S Scope of application: suitable for lithium batteries with a nominal voltage of 3.7V and full voltage of 4.2V (including 26650, polymer lithium batteries, no limitation on dimensions) Product size: 45*15*3.4mm (Standard), 48*20*3.4mm (balancing) Charging voltage: 8.4V - 9.0V Continuous discharge current (upper limit): 20A (if the cooling environment is not good, reduce the load current consumption) Continuous charging current (upper limit): 10A Standard version: suitable for running drills with currents up to 25A below 50W or resistive loads below 168W.3S 3S 12.6V lithium battery balance board Range: nominal voltage 3.7V, full voltage 4.2V lithium battery (including 18650, 26650, lithium polymer battery) Applicable voltage: 12.6V Product size: 15*30 (40.50) * 2.4mm Balancing current: 100mA, suitable for 2000-4000mAh battery 4S Range: nominal voltage 3.7V, full voltage 4.2V lithium battery (including 18650, 26650, lithium polymer battery) Product size: 20 * 30 (40 .50)*2.4mm Product weight: 3g Applicable voltage: 16.8V Balancing current: 100mA, suitable for 2000-4000mAh battery Package includes: (Optional) 1 pcs PCB board (2S/3S/4S) Note: 1: This product cannot replace the use lithium battery protection board (no overcharge protection and over-discharge protection); Working: first full single battery discharge, waiting for other batteries filled. 2: strictly according to the map wiring, then wrong line may lead to board burning; The balance board works when the heat is large, please isolate the battery.3: This product is used in parallel with the common lithium battery protection board, it can achieve balanced charging function.4: If the battery capacity internal resistance difference is too large, it will not long to balance or cannot complete the balance situation, it is recommended to re-match the battery