DELL MR90Y Original Battery

The Dell MR90Y battery is a genuine OEM option available in both 4-cell (38–40 Wh, 14.8 V) and 6-cell (65 Wh, 11.1 V) configurations. It fits a wide array of Inspiron, Latitude, and Vostro laptops. For best compatibility and performance, confirm part number, voltage, and cell count. Purchase from reliable sources to avoid counterfeit units—and use Dell diagnostic tools to verify authenticity.

Core Specifications
 

Part Number: MR90Y (also labeled XCMRD, 0MF69, G019Y, 6HY59, 312‑1387, 312‑1390, 49VTP, and more) 

Chemistry: Lithium-ion

Voltage & Capacity Options:

14.8 V, 38 Wh (4‑cell) – nominal capacity ~2,600 mAh 

14.8 V, 40 Wh (4‑cell) – similar spec, widely used

11.1 V, 65 Wh (6‑cell) – higher-capacity variant also sold under MR90Y/XCMRD/0MF69 PNs

Performance & Durability

Run time:

4‑cell: ~4–6 hours light use

6‑cell: significantly longer, dependent on workload and hardware

• Charge cycles: up to ~600 cycles for 65 Wh variant; no memory effect
• Safety features: includes overcharge, overheat, and short-circuit protection built-in