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AND SAFETY---Protection Board will protect battery pack from overcharging, over-discharging over-current and short circuit and circuit board is the heart of battery pack, must to have to avoid battery pack from explosion, fire and damage INVINCIBLE CONFIGURATION---Charge Voltage:21V;Charge Current:15A(Max.);Discharge Current:15A(Max.);Momentary Discharge Current:25A EXQUISITE DESIGN---Choosing the correct board and applying it appropriately is vital to the longevity your batteries 0 IMPECCABLE PRACTICABILITY---The board is for 5 series cell Li-ion batteries of electric power tool,18650,etc;Stable various charging and discharging protective functions are great for 5S battery