Mechrevo i5 8250U 15.2V Compatible Battery 3250mAh 49.4Wh

Mechrevo i5 8250U / i7 8550U Series — 15.2V Li-Polymer Replacement Battery

This is a 15.2V, 3250mAh (49.4Wh) lithium-polymer replacement battery for Mechrevo laptops running Intel Core i5-8250U and i7-8550U processors. It fits both 8GB and 256GB storage configurations across the supported model range. Install it when the original cell no longer holds a usable charge or the system reports critical battery health.

• i5 8250U and i7 8550U compatibility: Both the i5-8250U and i7-8550U platforms in this Mechrevo generation share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why one cell covers the full model range across 8GB and 256GB variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the target platform. The BMS negotiated correctly, charge current accepted at the expected rate, and the protection circuit tripped at the correct low-voltage threshold without requiring manual intervention.
• Post-install calibration: After fitting this cell, run the laptop down to hibernate cutoff on a normal workload, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after replacement

The BIOS does not automatically recognise a new cell as healthy. It reads residual EEPROM data from the old battery's charge history and flags the replacement as degraded before it has completed a single cycle. This is a firmware-side artefact, not a fault with the new cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% and the health indicator will update correctly.

Laptop shuts down at 20–30% charge shown on the fuel gauge

This happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. When a fresh cell is installed, the IC misreads the remaining capacity and signals shutdown before the actual charge is exhausted. The cell voltage at that cutoff point is typically still above 3.2V per cell — well within safe range. Two to three full discharge-and-charge cycles recalibrate the IC against the new cell's actual voltage profile and the premature shutdowns stop.