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Rectangular black lithium-ion laptop battery pack, 1.25 kg

eReplacements

eReplacements 57Y4186-ER laptop battery 11.1V 7800 mAh

SKU CH-2ATC-9Q6BX MPN 57Y4186-ER

Replacement lithium-ion battery rated 11.1V and 7800 mAh for compatible Lenovo laptops

  • TypeBattery
  • Battery TypeLithium-Ion
  • Battery Voltage11.1V
  • Battery Capacity7800 mAh
  • Weight1.25
  • Replacement battery fits Lenovo 57Y4186 models
  • 7800 mAh capacity extends runtime between charges
  • 1 V lithium-ion chemistry matches original specs
  • Built-in protection guards against overcharge and thermal issues
  • ISO 9000 factory quality with 1 year warranty

What This Battery Replaces

The eReplacements 57Y4186-ER is a new lithium-ion laptop battery rated at 11.1V and 7800 mAh. It is built as a direct replacement for the original Lenovo 57Y4186 pack. The unit weighs 1.25 units and uses a TI chip set for cell management.

Check Your Current Pack First

Before ordering, confirm that your existing battery carries the exact part number 57Y4186 on its label. Verify that the voltage printed on the old pack reads 11.1V and that the physical shape and connector orientation match the replacement. A different part number or voltage means this unit will not fit or function correctly.

Safety Features Built In

The battery casing uses fire-resistant plastic and includes multiple hardware protections: high and low temperature shut-off, thermal runaway prevention, overcharge shut-off, discharge shut-off and cell imbalance shut-off. These circuits operate automatically and require no driver installation or user configuration.

Highlights

  • Replacement battery fits Lenovo 57Y4186 models
  • 7800 mAh capacity extends runtime between charges
  • 1 V lithium-ion chemistry matches original specs
  • Built-in protection guards against overcharge and thermal issues
  • ISO 9000 factory quality with 1 year warranty

Specifications

Brande-Replacements
Model57Y4186-ER
TypeBattery
Battery TypeLithium-Ion
Battery Voltage11.1V
Battery Capacity7800 mAh
Weight1.25
Shipping weight0.59 kg
Package size240 × 150 × 60 mm

Questions about this item

Does the 57Y4186-ER battery ship with any cables or tools, or is it just the battery?

The package contains the 11.1V 7800 mAh lithium-ion battery only; no cables, screws or installation tools are included.

Is the 7800 mAh version the only capacity offered for this model, or are there lower-capacity alternatives?

This listing is for the 7800 mAh capacity; other capacities for the same part number are not shown in the product data.

What runtime can I expect from the 7800 mAh rating on a typical Lenovo laptop?

The 7800 mAh rating at 11.1V stores about 86 Wh; actual runtime depends on the laptop's power draw, screen brightness and workload.

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