About this replacement
URC MX-5000 / TRC-1280 — 3.8V Li-ion Replacement Battery (BT-NLP2400)
This 3.8V, 4200mAh Li-ion battery replaces the original pack in the URC MX-5000 and TRC-1280 programmable universal remotes. Both remotes share the same battery bay dimensions and BMS handshake, so one part fits both. OEM part numbers BT-NLP2400 and NC1110 both cross to this cell.
- MX-5000 and TRC-1280 compatibility: These two remotes run off the same 3.8V single-cell platform with matching connector pinout and BMS communication protocol. The battery bay measures 76.27 × 37.15 × 12.50mm — fit is exact on both units.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the MX-5000. The BMS reported correct cell voltage, accepted a full charge without error flags, and IR output held steady across the full discharge curve.
- Single-cell remote install tip: After swapping the battery, hold the remote within 30cm of any device and press several buttons to confirm IR output before reprogramming macros. A loose connector seating is far easier to catch now than after a full macro rebuild.
Why the MX-5000 stops responding mid-use even with a charged battery
An aged Li-ion cell in the MX-5000 can show 3.6V at rest but sag below 3.2V the moment the IR LED array fires. That voltage sag triggers the BMS undervoltage cutoff, and the remote goes unresponsive. The remote then recovers within seconds once the draw stops, which makes the fault look intermittent. Replacing the cell eliminates the sag because the new cell has lower internal resistance and holds voltage under load.
MX-5000 not responding at all after battery replacement
This remote uses a JST-style connector that can seat 90% of the way without making a full electrical connection. If the remote shows no response immediately after install, press the connector firmly until it clicks — do not rely on friction alone. If it still does not respond, check that the replacement cell reads at least 3.7V with a multimeter before suspecting the remote itself. A cell shipped in storage protection mode may need a short charge cycle to wake the BMS before the remote will power on.