Lenovo K4450 Notebook - Manual (Page 30)

• 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