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These batteries do not have easy to measure voltage curve as battery discharges to see state of charge. More of sharp voltage drop when battery is depleted just before it can't be charged by normal charger. This is reason for multiple charge cycles teaching when new battery is fully charged or depleted to point it must be charged. When battery must be charged, battery manager will not let reader operate from battery power until charged. Battery manager also learns when battery is fully charged.
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