Dr. Battery MPL08251P-20 6-Cell 4400mAh 10.8V Laptop Battery

Replacement Battery for HP ProBook Series

The Dr. Battery MPL08251P-20 is a new 6-cell lithium-ion unit built for HP ProBook 4330s, 4331s, 4430s, 4431s, 4435s, 4436s, 4440s, 4441s, 4446s, 4530s, 4535s, 4540s and 4545s models. It delivers 4400 mAh at 10.8 V for 48 Wh of capacity. A built-in smart chip manages charging and provides short-circuit, overheat and overload protection. Buyers needing a different form factor or higher watt-hour rating should look elsewhere.

Upgrading from Depleted OEM Packs

This battery replaces original part numbers including 633733-151, 633733-1A1, 633733-241, 633733-251, 633733-321, 633805-001, 633809-001, 650938-001, HSTNN-1B2R and HSTNN-DB2R. The jump is worth it when the original pack no longer holds a useful charge or shows swelling. It restores the original 10.8 V specification without altering the laptop's power profile. Users whose machines require a different voltage or connector layout cannot use this unit.

Limits of the 10.8 V 6-Cell Format

The 6-cell lithium-ion chemistry fixes the energy ceiling at 48 Wh, so runtime scales directly with the notebook's power draw. Heavy workloads will drain the pack faster than light office tasks. The smart chip stops charging once the cells reach their voltage limit, preventing overcharge but not extending the fundamental capacity. The battery fits only the listed ProBook chassis; other HP families or non-HP laptops are mechanically and electrically incompatible.