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Black rectangular lithium-ion laptop battery with label showing 99Wh 11.25V

Beisite

Beisite L17C6P51 L17M6P52 99Wh laptop battery

SKU CH-Z7D8-ABCE0

99 Wh lithium-ion replacement battery for Lenovo ThinkPad P72 and P73 series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.25 V
  • Battery capacity99 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor ThinkPad P72 P73 P72-20 MB P73-20QR Series
  • 99Wh capacity supports extended work sessions on ThinkPad P72 and P73
  • 25V lithium-ion chemistry matches original power specifications
  • Replaces multiple OEM part numbers including 01AV497 and 01AV498
  • Compatible with numerous P72 and P73 sub-models such as 20MB and 20QR series
  • Brand new condition ensures full rated capacity from first charge

What this battery is and who it fits

The Beisite L17C6P51 L17M6P52 is a 99Wh lithium-ion replacement battery built for Lenovo ThinkPad P72 and P73 series mobile workstations. It operates at 11.25V and comes in black, matching the original form factor for a direct swap. Technicians and power users who need to restore full runtime on these machines will find the correct fit across the extensive model list.

Replaces original part numbers 01AV497 01AV498

This unit substitutes the factory batteries carrying part numbers 01AV497, 01AV498, L17C6P51, L17M6P52 and 31CP6/54/90-2 among others. The two voltage variants L17C6P51 and L17M6P52 are cross-compatible so either version will work when the original no longer holds charge. The upgrade is worth it when the system shows reduced capacity or sudden shutdowns under load.

Suits ThinkPad P72 P73 owners needing 99Wh capacity

Buyers who want a higher or lower capacity than 99Wh should look at a different specification because this model is fixed at that energy rating. Users of other ThinkPad series or non-Lenovo laptops cannot use this battery due to connector and firmware differences. Anyone requiring a different voltage or physical layout must select an alternative part.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $39.99
Pricier than about 71% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameL17C6P51 L17M6P52
Model nameL17C6P51 L17M6P52
Part number31CP6/54/90-2
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.25 V
Battery capacity99 Wh
Compatibility
Compatible withFor ThinkPad P72 P73 P72-20 MB P73-20QR Series

Questions about this item

Will the L17C6P51 battery fit inside my ThinkPad P72 without any case modification?

Yes, the L17C6P51 is built to the original chassis dimensions for the ThinkPad P72 and P73 series, so it seats in the standard battery bay without trimming or adapters.

What is the most common mistake when installing the 99Wh 11.25V pack in a ThinkPad P73?

People often forget to disconnect the internal CMOS coin cell before swapping the main pack; skipping that step can leave the system in a deep-sleep state that ignores the new battery.

After how many charge cycles should I expect the 31CP6/54/90-2 lithium-ion unit to drop below 80 % capacity?

Typical lithium-ion cells of this chemistry reach roughly 300 full cycles before capacity falls under 80 %, so plan a replacement around that mark if you run daily full discharges.

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