About this replacement
Dell Latitude 5290 / 12 5285 2-in-1 — 7.6V Li-Polymer Replacement Battery (J0PGR)
This is a 7.6V 5200mAh lithium-polymer battery replacing OEM part J0PGR across the Dell Latitude 5285 and 5290 series, including the N003L7390-C-D1606FTCN and N012L7390-C-D1706FTCN configurations. It fits the slim 2-in-1 and clamshell chassis variants that share the same connector and BMS handshake protocol. Capacity is 39.52Wh — matching the original specification exactly.
- Latitude 5285 / 5290 platform fit: These models share the same 7.6V power rail, physical connector, and Dell EC communication protocol — which is why one cell covers both the 2-in-1 and standard Latitude 5290 chassis without modification.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a Latitude 5290. The BMS handshook with the EC on first boot, charge current ramped normally, and the protection circuit triggered at the correct low-voltage cutoff without nuisance tripping.
- Post-install learn cycle on Dell EC: After installing, run a full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the Dell battery learn cycle in the EC and clears the inaccurate health warning that appears after every cell swap — it is not a fault with the new cell.
BIOS reporting battery health as poor after replacement
The Dell EC reads cycle count, charge history, and design capacity from EEPROM data stored on the old cell. When a new cell installs, that EEPROM data is either absent or zeroed, and the EC flags it as degraded before any charge history exists. This is a firmware behaviour, not a battery fault. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the EC writes a new baseline and the health warning clears on the next boot.
Laptop shuts down at 20–30% shown on the fuel gauge
The fuel gauge IC calibrates its state-of-charge model against the old cell's impedance curve. A new cell has lower internal resistance, so the IC underestimates how much voltage will drop under combined CPU and display load — it reaches the hardware cutoff voltage before the percentage hits zero. The fix is two to three full discharge-charge cycles, which let the fuel gauge IC build an accurate model against the new cell's actual curve. After calibration, shutdowns at false percentages stop. Target 7.6V at rest and 6.8V minimum under load as your check values.