BlackBerry DTEK50 TLp026E2 Compatible Battery 3.8V 2200mAh

BlackBerry DTEK50 / Neon — 3.8V Li-Polymer Replacement Battery (TLp026E2)

This 3.8V, 2200mAh Li-Polymer cell replaces the TLp026E2 battery in the BlackBerry DTEK50, DTEK50 LTE (STH100-1, STH100-2), and Neon. It fits devices where the original cell has degraded and no longer holds a usable charge through a normal day of use. Capacity figure is 8.36Wh — matching the OEM specification.

• STH100-1 and STH100-2 coverage: Both DTEK50 hardware revisions use the same battery bay dimensions, connector pinout, and BMS communication protocol — one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the DTEK50 platform and confirmed the BMS handshake completes correctly — the charge IC accepted the cell and stepped through trickle, CC, and CV phases without fault flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC build an accurate discharge curve against the new cell before the charge IC begins pushing higher current into an uncalibrated state of charge register.

Sudden shutdown at 20–30% on the DTEK50 after a cell swap

This is a voltage cliff problem, not a capacity problem. The DTEK50's modem and display together draw enough current that a new cell — not yet characterized by the fuel gauge IC — can sag below the system cutoff voltage before the percentage counter reaches zero. The phone shuts down because the rail drops, not because the cell is empty. One full discharge-charge cycle at standard rate lets the coulomb counter align its model to the actual cell, and the shutdowns stop.

OS reporting wrong battery percentage after replacement

The DTEK50 uses a fuel gauge IC that stores a learned discharge curve from the previous cell. After swapping to a new cell, the old curve no longer matches, so the percentage reading drifts — often reading high then dropping sharply. The fix is a full calibration cycle: charge to 100%, let the device discharge under normal use until it shuts off automatically, then charge back to 100% uninterrupted. After one complete cycle, the fuel gauge IC rewrites its model and the percentage stabilizes.