SUNNEAR Laptop Battery L18C4PF3 45Wh for Lenovo 14"

The SUNNEAR L18C4PF3 is a direct-replacement 45Wh, 15.36V Li-ion battery designed to restore runtime to compatible Lenovo IdeaPad, Flex and C340 14-inch laptops.

If your Lenovo S540, C340, IdeaPad Flex-14 or similar 14-inch model is running out of charge quickly, this SUNNEAR pack offers a like-for-like swap to bring back hours of portable use. The battery matches the original L18C4PF3/L18M4PF3 family of part numbers and ships with basic installation tools so you can replace the cell at home. It uses the same voltage and connector form factor as the factory unit to ensure compatibility with the models listed below.

Which Lenovo models will this battery work with?

This pack is compatible with a range of 14-inch Lenovo notebooks that originally shipped with L18C4* or L18M4* batteries. It fits multiple IdeaPad S540, C340 and Flex-14 variations, including touch and non-touch SKUs where the battery model matches.

• IdeaPad S540-14API / S540-14IML / S540-14IWL series
• C340-14API / C340-14IML / C340-14IWL convertible notebooks
• Flex-14API / Flex-14IML / Flex-14IWL models (including Type 81SS variants)
• Compatible part numbers: L18C4PF3, L18M4PF3, L18M4PF4 and listed OEM codes

How do I install the SUNNEAR replacement safely?

Installation is a straightforward, low-risk process if you take basic precautions: power down, remove external power, and discharge residual charge. The battery ships with small tools for opening the back cover; confirm the original battery's part number before removing it to avoid model mismatches.

• Shut down the laptop and unplug the charger before opening the case.
• Remove the back panel using the included tools and compare part numbers.
• Seat the new battery connector firmly and reassemble the chassis.
• If not immediately detected, reseat the connector and perform a few charge/discharge cycles.

What are the technical specs and recommended first steps?

The SUNNEAR battery is a 45Wh (2964mAh) lithium-ion pack rated at 15.36V, matching OEM electrical requirements. After installation, a short calibration routine helps the system recognize and report battery capacity accurately.

• Voltage: 15.36V — matches factory requirement for listed models.
• Capacity: 45Wh / 2964mAh — restores comparable runtime to the original cell.
• Type: Li-ion, with included tools for on-device replacement.
• Calibration tip: run down to ~5% (avoid 0%), then recharge and repeat 3–4 cycles.

Will this battery behave exactly like the original Lenovo unit?

This aftermarket pack is engineered to be functionally equivalent to the OEM battery in voltage, connector, and capacity, but behavior can vary slightly by system firmware. If the laptop doesn’t recognize the new battery immediately, the recommended reconnection and calibration steps usually resolve detection or reporting issues.

• Designed to match original connectors and form factor for direct replacement.
• May require initial power cycles to calibrate charge reporting accurately.
• Check the laptop’s original battery model number before purchase to ensure fit.

Who is this for: The SUNNEAR L18C4PF3 replacement suits owners of compatible Lenovo 14-inch IdeaPad, Flex and C340 models who need to restore mobile battery life without replacing the whole laptop. It’s intended for users comfortable opening their device or for technicians performing a quick swap — and for anyone who prefers an OEM-compatible, same-voltage pack with basic installation tools included.