About this replacement
Sena Grip Remote Control — 3.7V Li-Polymer Replacement Battery (AHB401225)
This 3.7V, 90mAh Li-Polymer cell replaces the original AHB401225 battery inside the Sena Grip Remote Control, Handlebar Remote SC-HR-01, and Wristband Remote SC-WR-01. These wireless remotes pair with Sena motorcycle communication headsets to let riders manage calls and audio without touching the helmet unit. When the original cell loses capacity, button presses become unreliable or the remote stops holding a charge between rides.
- Grip, Handlebar, and Wristband Remote compatibility: All three remotes share the same 3.7V Li-Polymer cell footprint, BMS handshake protocol, and flat connector pinout. Swapping between remote types does not require a different cell — the AHB401225 spec covers the full range.
- Bench tested on actual hardware: We cycled this cell through pairing, sustained button transmission, and low-battery cutoff. The BMS held the protection threshold steady at the low end, and the remote re-paired to the headset without a factory reset after the cell swap.
- First charge after installation: Charge the remote fully via its standard cable before pairing it to the headset again. The Sena remote's firmware recalibrates its battery indicator on the first complete charge cycle — skipping this step causes the headset app to display inaccurate charge levels until that cycle completes.
Why the Sena remote cuts out mid-ride on a new battery
The Grip and Handlebar remotes transmit over Bluetooth while simultaneously running the button-press microcontroller. That combined draw is small in absolute terms, but at 90mAh total capacity, a brief voltage sag under simultaneous radio and logic load can trip the BMS cutoff prematurely. This is more likely at cold temperatures where Li-Polymer internal resistance rises. If cutouts happen in the first week, run two to three full charge-discharge cycles — internal resistance drops and the BMS threshold becomes more stable relative to actual cell voltage.
Remote shows full charge in the Sena app but stops responding after short use
A replacement cell ships at storage voltage — typically 3.6–3.8V — which the Sena app reads as near-full before the first complete cycle. The firmware has not yet mapped the cell's actual discharge curve, so the charge percentage display is unreliable. The remote cuts off because the cell hits its real low-voltage floor well before the app expects it to. Run one full charge from empty to 100% while the remote is off, then re-pair — the app's estimate will track accurately from that point.