Dr. Battery MPL09200P-21 6-cell 10.8V 4400mAh laptop battery

Replacement Battery for ThinkPad T500 Series

This Dr. Battery MPL09200P-21 replaces the original IBM ThinkPad Elite T500 battery and matches part numbers 42T4504 through 42T4623. It fits a wide range of ThinkPad models including T60, T61, R500, R61i, SL500 and W500. The six-cell lithium-ion pack delivers 10.8V and 4400mAh capacity. Buyers who need a different voltage or a higher capacity pack cannot use this unit.

Sustained Runtime and Protection Behaviour

The integrated smart control chip manages charging current to reduce heat during long sessions and extends discharge time under steady load. Built-in safeguards cut power automatically if a short circuit, overheat or overload condition is detected. The lithium-ion cells maintain stable output throughout the discharge cycle without sudden voltage drops. The one-year warranty period reflects the manufacturer's confidence in consistent daily performance.

Deciding Specification: 4400mAh at 10.8V

Capacity and voltage together determine whether this battery matches the original 48Wh specification your laptop expects. Verify the original part number — such as 40Y6796, 40Y7700 or 40Y7711 — and confirm the laptop label reads 10.8V before ordering. A mismatch in either value will prevent correct charging or runtime. No other specification overrides this electrical match.