Battery Model / Part Numbers: 266J9 (also referenced as 0266J9, M4GWP, 0M4GWP)
Battery Chemistry / Type: Lithium-Ion (Li-Ion) / Li-Polymer
Voltage: 11.4 V
Capacity / Energy: 51 Wh (≈ 4255–4474 mAh)
Cell Configuration: 3-Cell pack
Color / Housing: Black (standard OEM-style)
Battery Condition (as sold): Brand new / OEM or OEM-spec; “Grade A” cells, 100% new manufacturer battery pack.
Protection / Safety Features: Built-in safeguards typically include protection against incorrect voltage, over-charge / over-discharge, overheating, and short-circuit.
Expected Lifespan / Cycle Count: Often rated for ~500+ recharge cycles under normal use.
Compatible Laptop Models / Series (all known compatible models / series — confirm original battery part number before purchase):
Dell G-Series laptops: G3 15 (3500, 3590, 3790)
Dell G-Series laptops: G5 15 (5500, 5505)
Dell Inspiron series (including 14-5490 and 15-series sub-models such as 15PR-1545W / 1548BR / 1645W / 1648BR / 1742BR / 1742W / 1748BR etc.)
Dell Inspiron 5490 / 5498 series
Usage / Replacement Notes:
This battery (266J9, 51 Wh / 3-cell) is one of the standard battery configurations for the compatible laptops. On some models there is an alternative higher-capacity battery configuration (e.g., 4-cell 68 Wh battery, part number MV07R). Users should confirm the part number on their original battery before purchasing to ensure compatibility.
Replacing a 68 Wh original battery with this 51 Wh 266J9 will work physically — but runtime may be reduced accordingly.
Because of built-in protection circuits and OEM-style construction, this battery is designed to be a plug-and-play replacement in supported systems
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