Dr. Battery Professional Series laptop battery 15.2V 3000mAh for Dell Latitude 5420 5520 Precision 3560

Professional Series battery for Latitude

The Dr. Battery Professional Series unit is a new lithium-polymer replacement built for Dell Latitude 5420, Latitude 5520 and Precision 3560 laptops. It operates at 15.2 volts and stores 3000 milliampere-hours of charge, matching the original Dell part numbers listed in the compatibility table. Business users and IT teams can install it to restore factory-grade mobility without changing the laptop itself.

Sustained output and cycle life

OEM-grade cells provide steady voltage across the full discharge curve, so the laptop does not throttle unexpectedly during long meetings or travel days. Integrated protection circuits guard against over-charge, over-discharge, overheating and short-circuit events that can degrade cells prematurely. The battery is tested to maintain usable capacity over many charge cycles under typical office workloads.

Straightforward swap with key alignment

The pack measures 8.0 by 1.5 by 0.8 and weighs 0.4, matching the original form factor so it seats in the bay without force. Installation requires releasing the latch, sliding the old pack out and pressing the new one in until the latch clicks. The most common issue is forgetting to fully engage the latch, which leaves the battery loose and prevents charging.