HTC Desire 526 Replacement Battery BOPL4100 3.8V 2000mAh

HTC Desire 526 Series — 3.8V Li-ion Replacement Battery (BOPL4100)

This is a 3.8V, 2000mAh Li-ion replacement battery for the HTC Desire 526, Desire 526G+ Dual SIM, Desire 326G, and HTCD100LVWP. It replaces OEM part numbers BOPL4100, BOPM310, and HQ60331141000. Physical dimensions are 69.30 × 56.00 × 4.50mm — measure your existing cell before ordering if the device has been previously repaired.

• Desire 526 and 526G+ compatibility: The Desire 526 and 526G+ Dual SIM share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 326G uses the same form factor with identical voltage rails, which is why all four models accept the same cell.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Desire 526 unit. The BMS accepted full charge without triggering overcurrent cutoff, and the fuel gauge IC registered capacity correctly after one complete cycle.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC on the Desire 526 calibrates against the cell's discharge curve — skipping this step leaves the coulomb counter reading against the old cell's data, causing erratic percentage jumps for the first several sessions.

Sudden shutdown at 20–30% on the Desire 526 after a cell swap

The Desire 526 modem and display draw a combined surge that can pull the cell voltage below the BMS cutoff threshold before the fuel gauge shows zero. A new cell with an uncalibrated coulomb counter makes this worse — the OS believes 25% remains, but the cell voltage has already dropped to around 3.5V under load. The BMS then triggers a hard cutoff to protect the cell. One full discharge-charge cycle resets the fuel gauge IC's internal model and closes the gap between reported and actual state of charge.

Phone will not power on after the replacement battery sat in storage

Li-ion cells self-discharge in storage, and a cell that has dropped below approximately 2.5V will trigger BMS lockout — the protection circuit opens and blocks current flow entirely to prevent cell damage. The phone will show no charge indicator and will not respond to a standard USB cable. Connect to a wall charger, not a PC port, and leave it undisturbed for 20–30 minutes before attempting to power on — a wall adapter delivers enough trickle current to bring the cell above the BMS re-enable threshold of around 2.8V.