About this replacement
Nevo Q50 — 3.7V Li-Polymer Replacement Battery (CS503759 1S1P)
This 3.7V, 1200mAh lithium-polymer battery replaces the original cell in the Nevo Q50 universal remote control. It fits the Q50's single-cell bay and restores IR transmission to televisions, streaming devices, and other paired electronics. Capacity is 4.44Wh, matching the original specification.
- Nevo Q50 fit: The Q50 runs a single-cell 3.7V Li-Polymer configuration. This battery matches that voltage rail, the 60.12 × 36.30 × 4.96mm form factor, and the connector orientation so it seats without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Q50 platform. The protection circuit tripped correctly at low-voltage cutoff and resumed normal charge acceptance without manual reset.
- Single-cell swap rule: The Q50 uses one cell. When it goes, replace it entirely — do not attempt to revive a fully depleted Li-Polymer cell by leaving it on charge for extended periods. If the battery has sat discharged for weeks, the BMS may refuse to accept a charge until voltage is restored above the wake threshold by a compatible charger.
Why the Q50 stops responding mid-session even with a charged battery
Li-Polymer cells in remotes lose the ability to deliver consistent peak current as they age, even when resting voltage reads acceptable. The Q50's IR LED needs a clean burst of current to fire a full-strength signal. An aged or partially discharged cell sags under that brief load, and the signal either drops out or transmits weakly. The device at the other end misses the command. A fresh cell at 3.7V resolves this — resting voltage alone is not a reliable indicator of a cell's burst capability.
Q50 remote still dead after new battery fitted
The most common cause is reversed polarity — the Li-Polymer cell has a marked positive and negative terminal, and the Q50 bay does not block a backwards install. Check the orientation against the markings inside the compartment before assuming the battery is faulty. If orientation is correct and the remote still does not respond, the original cell may have discharged the new one through a brief reverse-current event — charge the new cell to 3.7V with a compatible Li-Polymer charger, then reinstall.