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Rectangular black laptop battery with six cells visible on one side

Dr. Battery

Dr. Battery MPL05271P-20 6-cell 11.1V 4400mAh laptop battery

SKU CH-S791-1CV1V

Six-cell lithium-ion replacement battery delivering 11.1 V and 4400 mAh for Dell Vostro 2421, 2521, 3445, 3446, 3449, 3546 and 3549 models

  • Battery type6 Cell Lithium-Ion
  • Battery voltage rating11.1 V
  • Battery capacity4,400 mAh
  • Product colorBlack
  • Product typeBattery
  • Compatible withDell Inspiron 14(3421) / 14(3437) / 14(3442) / 14R(5421) / 1
  • Compatible with many Dell Inspiron 14, 15 and 17 models
  • 6-cell lithium-ion design delivers 4400 mAh at 11.1 V
  • Built-in smart chip enables short-circuit, overheat and overload protection
  • 49 Wh capacity supports extended runtime between charges
  • Brand-new condition backed by one-year manufacturer warranty

Replacement battery for Dell Inspiron laptops

The Dr. Battery MPL05271P-20 is a new six-cell lithium-ion unit built to replace the original power pack in compatible Dell Inspiron 14, 15 and 17 models. It targets owners of listed systems such as the 3421, 3521, 3721, 5421, 5521 and 5721 series who need a direct swap for a depleted or missing battery.

11.1V 4400mAh capacity matches OEM specification

The single figure that decides fit is the electrical rating: 11.1 volts and 4400 milliampere-hours, equating to 49 watt-hours. Only laptops whose original battery shares this exact voltage and capacity should use this part; different voltages or capacities will not work correctly.

Smart control chip manages thermals and safety

An integrated circuit regulates charging current, limits power draw during discharge and activates short-circuit, overheat and overload protection. In normal use the pack runs at the designed voltage without excess heat or audible noise, delivering stable runtime until the cells reach end of charge.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $36.99
Pricier than about 66% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameDr. Battery
Model nameMPL05271P-20
Product colorBlack
Product typeBattery
Power
Battery type6 Cell Lithium-Ion
Battery voltage rating11.1 V
Battery capacity4,400 mAh
Compatibility
Compatible withDell Inspiron 14(3421) / 14(3437) / 14(3442) / 14R(5421) / 15(3521) / 15(3531) / 15(3541) / 15(3542) / 15(3543) / 15R(5521) / 15R(5537) / 17(3721) / 17(5748) / 17R(5721) / 17R(5737)
Dell Inspiron 3421 / 3437 / 3443 / 3521 / 3531 / 3537 / 3543 / 3721 / 5749 / 3847 / 5421 / 5437 / 5521 / 5537 / 5721 / 5749 / 7447
Dell Latitude 3440 / 3540 / E3440
Dell Vostro 2421 / 2521 / 3445 / 3446 / 3449 / 3546 / 3549
Original Battery Part Number :
0MF69 / 24DRM / 312-1387 / 312-1390 / 312-1392 / 312-1433 / 451-12107 / 451-12108 / 49VTP / 4DMNG / 4WY7C / G019Y / MR90Y / V8VNT / XCMRD / YGMTN
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Questions about this item

How long will the 4400 mAh rating last in my Dell Inspiron 15 3521?

The 4400 mAh capacity at 11.1 V delivers about 49 Wh, which typically powers a compatible Inspiron 15 3521 for several hours of mixed use before needing a recharge.

What does the 11.1 V specification mean for charging and daily use?

The 11.1 V output matches the original Dell battery voltage, so the laptop's charging circuit recognises it immediately and charges it to full capacity without any adapter changes.

Will the 6-cell pack fit the battery bay on my Inspiron 17 5748?

Yes, the pack is built to the OEM 6-cell form factor for the Inspiron models listed, so it slides into the 17 5748 bay and locks with the existing latches.

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