MULS L21D4P71 L21M4P71 Laptop Battery for Lenovo ThinkPad T14/ P14s Gen 3

About MULS
1. We have professional battery and adapter experience!
Strictly test before shipment to ensure full capacity and safety without harming the computer!
2. We recommend that the first charge is not less than 5 hours.
3. The new battery cannot be charged, is there a problem with the battery?
Usually not. The computer charges the battery for the first time. Due to the instability of voltage and current, the computer may stop charging the battery when the battery is half charged (sometimes more, sometimes less). If this happens, Don't worry, just take the battery out of the computer and recharge it again. The new battery charged for the first time may require several iterations. Don't worry, this is normal.
4. When the battery is in normal operation, if the battery is discharged to 3%, it must be shut down or recharged. If the battery is discharged to 0%, the battery will be damaged and its life will be attenuated.
5. Avoid falling, heating, and short-circuit, avoid using the battery in an environment where the temperature is too high or too low.
Specification:

Voltage: 15.48V
Capatity: 52.5Wh 3392mAh 4-cell
Condition: Brand new from manufacture, Grade A cell
Replacement for Part Number

L21M4P72 SB10W51966 5B10W51865 SB11M89828 5B11M90027 SB10W52002 5B10W51901
L21L4P71 SB10W51964 5B10W51863 SB11M89826 5B11M90025 SB10W52000 5B10W51899
L21M4P71 SB10W51965 5B10W51864 SB11M89827 5B11M90026 SB10W52001 5B10W51900
L21C4P71 SB10W51967 5B10W51866 SB11M89829 5B11M90028 SB10W52003 5B10W51902
L21D4P71 SB10W51968 5B10W51867 SB11M89830 5B11M90029 SB10W52006 5B10W51905
L21M3P71 SB10W51962 5B10W51861 SB11M89824 5B11M90023
L21L3P71 SB10W51961 5B10W51860 SB11M89823 5B11M90022
L21C3P71 SB10W51963 5B10W51862 SB11M89825 5B11M90024
Compatible Laptop Models:

Fit for Lenovo ThinkPad T14 Gen 3 (Type 21AH, 21AJ, 21CF, 21CG) series
Fit for Lenovo ThinkPad T14 Gen 4 (Type 21HD, 21HE, 21K3, 21K4) series
Fit for Lenovo ThinkPad P14s Gen 3 (Type 21AK, 21AL, 21J5, 21J6) series
Fit for Lenovo ThinkPad P14s Gen 4 (Type 21HF, 21HG, 21K5, 21K6) series
Note: Please open the back cover of your laptop to check the original battery size and capacity before placing an order.
1. Turn off your laptop and disconnect the power.
2. Disconnect the connection between the old battery and the motherboard to avoid unnecessary damage caused by disassembling the battery. Then unscrew the old battery screws one by one and carefully save each screw.
3. Remove the old battery, carefully connect the new battery to the mainboard, reinstall all the parts that have been removed earlier, and connect the wiring of the new battery.
4. If you don't understand the above steps, you can search the relevant installation tutorial video on YouTube for help.
1. New battery: Discharge the new battery to 10% (not 0%), then charging up to 95% and repeat 3-4 times to activate the maximum capacity.
2. Overuse: Do not always run out of a battery to 0%, that would damage the battery or shorten the usage life.
3. Charging sequence: when charging, first install the battery, then turn on the power, when fully charged, first cut off the power, then pull the power plug.
4. Fully charge the battery before long-term storage, and keep charging once a month.
Do not store the battery at low power circumstances.
Could be caused by battery loss. Please re-install the battery and make sure that the battery cable and the motherboard interface are tightly inserted.
Maybe due to conductive material damage which the laptop motherboard and battery anode and cathode contact position, you can try to confirm it with your original battery.
Check whether the battery drive is in normal condition, if not, download the corresponding driver software to update.
Laptop Battery Usage & Inspection Guidelines
What should I be mindful