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If you suspect a "dead" battery, use a multimeter to check the balance pins. Sometimes a simple manual balance charge can revive a pack that the official charger has rejected. pbm27a-210-mv--r diagram
A larger envelope outside the S1 curve. This shows peak torque (e.g., 45 Nm) available for acceleration or high load cycles lasting less than 5 seconds. The diagram usually shades this zone with a dashed line. : If you suspect a "dead" battery, use