Lenovo M4400s Hardware Maintenance Manual - Lenovo M4400s - Page 30

Replace the system board if the new battery pack is not charged.

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• If the voltage is more than +12.0 V dc, discharge the battery pack until the voltage becomes less than +12.0 V dc and then recharge the battery pack. If the voltage still is less than +12.0 V dc after recharging, replace the battery pack. Note: Recharging will take at least three hours, even if the battery status indicator does not turn on. 5. Replace the system board if the new battery pack is not charged. 24 Hardware Maintenance Manual

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If the voltage is more than +12.0 V dc, discharge the battery pack until the voltage becomes less
than +12.0 V dc and then recharge the battery pack. If the voltage still is less than +12.0 V dc after
recharging, replace the battery pack.
Note:
Recharging will take at least three hours, even if the battery status indicator does not turn on.
5. Replace the system board if the new battery pack is not charged.
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Hardware Maintenance Manual