SNN5623A Motorola T190 Replacement Battery 3.7V 900mAh

Motorola T190 / T191 — 3.7V Li-ion Replacement Battery (SNN5623A)

This is a 3.7V, 900mAh Li-ion cell built to the SNN5623A specification for the Motorola T190 and T191 flip phones. It slots into the original battery bay using the same connector and contact layout as the factory cell. Capacity is 900mAh — identical to the original Motorola specification.

• T190 and T191 compatibility: Both models share the same battery bay dimensions, voltage rail, and SNN5623A connector pinout. One cell covers both handsets without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the T190 platform. The BMS accepted charge from the standard cradle charger, held the voltage curve through discharge, and tripped the low-voltage cutoff cleanly at the correct threshold.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge down to automatic shutoff, then charge uninterrupted to 100% before resuming normal use. The T190's fuel gauge IC calibrates its percentage tracking against that first complete cycle — skipping it causes erratic percentage readings from day one.

Why the T190 reports wrong battery percentage after a cell swap

The T190 uses a simple fuel gauge IC that builds its discharge model from the first few cycles it observes on a given cell. When a new cell goes in, the IC still references the old cell's learned curve. That mismatch causes the displayed percentage to jump or read higher than the actual state of charge. One full discharge-to-shutoff followed by a full uninterrupted charge resets that reference point. After that cycle, the percentage readout stabilises against the new cell's actual curve.

Phone won't power on after the battery sat in storage

Li-ion cells left uncharged for extended periods can drop below 2.5V per cell, triggering a BMS lockout that blocks normal startup. The T190 will show no response — no screen, no vibration — when this occurs. Connect the phone to a charger and leave it untouched for 20–30 minutes before attempting to power on; the charge IC needs time to trickle current into the cell before the BMS releases the lockout. If the battery reaches 3.0V, the phone should power on normally.