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Rectangular black lithium-ion laptop battery with four cells

FOCUSTEC

FOCUSTEC L12L4E01 4-cell 14.8V 2600mAh laptop battery

SKU CH-4CJT-XZJQW

A 4-cell 14.8V 2600mAh lithium-ion replacement battery with overcurrent, overcharge, overdischarge and temperature protection for compatible Lenovo laptops

  • Battery TypeLithium-Ion
  • Reliable power with 2600mAh 14.8V lithium-ion capacity
  • Built-in overcurrent, overcharge, overdischarge and temperature safeguards
  • Fits Lenovo G40, G50, Z40, Z50, Z70 and Z710 series
  • Replaces OEM part numbers L12L4E01, L12S4E01, L12M4E01 and 121500171
  • Rated for up to 500 recharge cycles over battery life

4-cell 14.8V Li-ion replacement battery

This FOCUSTEC L12L4E01 battery uses lithium-ion chemistry with a 2600mAh capacity and 14.8V output across four cells. It is built for owners of compatible Lenovo laptops who need a direct replacement for an ageing or failed original pack. The unit includes overcurrent, overcharge, overdischarge and temperature protection circuits. It is sold new and rated for up to 500 recharge cycles.

Suits owners of listed G, S and Z series models

The battery fits a wide range of Lenovo G40, G50, G400, G500, G510, S410, S510, Z40, Z50, Z70 and Z710 series machines as well as part numbers L12L4A02, L12L4E01, L12M4A02, L12M4E01, L12S4A02, L12S4E01 and 121500171 through 121500176. Buyers whose laptop model or part number does not appear in that list should look elsewhere because the connector or form factor will not match.

Simple swap with no tools in most cases

Installation typically involves sliding the release latch, removing the old pack and clicking the new one into place. No soldering or software configuration is required. The most common issue is inserting the battery upside down or failing to seat the locking tabs fully, which prevents the laptop from recognising the pack. A full charge before first use calibrates the protection circuit.

Highlights

  • Reliable power with 2600mAh 14.8V lithium-ion capacity
  • Built-in overcurrent, overcharge, overdischarge and temperature safeguards
  • Fits Lenovo G40, G50, Z40, Z50, Z70 and Z710 series
  • Replaces OEM part numbers L12L4E01, L12S4E01, L12M4E01 and 121500171
  • Rated for up to 500 recharge cycles over battery life

Specifications

Battery TypeLithium-Ion

Questions about this item

Which Lenovo laptop models does the FOCUSTEC L12L4E01 4-cell 14.8V 2600mAh battery fit?

It fits Lenovo G400s, G405s, G410s, G500s, G505s, G510s, S410p, S510p, Z710, G50, G50-30, G50-45, G40-30, G40-45, G40-70, G40-70M, G50-70, G50-80 and G50-70M.

Will the 14.8V 2600mAh Li-ion pack work with an original Lenovo charger rated for 20V output?

Yes — the battery’s built-in protection circuit manages the 14.8V chemistry while the laptop’s own charging regulator handles the 20V adapter input.

How can I verify the battery is charging correctly after installation?

The OS battery icon should show a charging animation, the capacity should read near 2600mAh and the pack should not trigger over-temperature or over-current warnings.

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