About this replacement
RTI T3V / T3-V+ Series — 3.7V Li-ion Replacement Battery (ATB-1700)
This is a 3.7V Li-ion cell rated at 1800mAh (6.66Wh), built to replace the original ATB-1700 battery inside the RTI T3V, T3-V, and T3-V+ control remotes. When the original cell loses capacity or fails to hold charge, the remote loses IR output strength and eventually stops responding altogether. This replacement restores full operating voltage to the remote's IR LED circuit and processor.
- T3V / T3-V / T3-V+ compatibility: All three model variants share the same battery bay dimensions, connector pinout, and 3.7V supply rail. The ATB-1700 footprint — 50.10 × 36.02 × 8.90mm — fits each without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The protection circuit trips cleanly at the low-voltage cutoff and accepts a full charge without thermal event or voltage spike at the connector.
- Connector seating on the T3V: The T3V uses a friction-fit connector that can appear seated when it is not. Press the connector firmly until you feel it click into contact — a half-seated connector causes intermittent power loss that looks like a dead battery.
Why the T3V IR signal weakens before the battery reads empty
The T3V's IR LED draws a brief high-current pulse with every button press. As the Li-ion cell ages and internal resistance rises, that pulse causes a momentary voltage sag — even when resting voltage still reads near 3.7V. The processor sees the sag as a low-voltage condition and throttles IR output before the battery gauge shows critical. The result is a remote that appears to have charge but needs to be held closer and closer to the device to trigger a response. Replacing the cell eliminates the sag and restores full IR pulse amplitude.
T3V shows charging but returns to 0% immediately after unplugging
This happens when the Li-ion cell has been deeply discharged below the protection circuit's recovery threshold — typically around 2.5V. The charger sees the circuit as connected and passes current, but the BMS blocks it from reaching the cell itself. Some cells recover if left on charge for 15–30 minutes at a low trickle before the BMS re-engages. If the remote still drops to 0% on unplug, the original cell is unrecoverable and the ATB-1700 replacement is the correct next step.