Directed Electronics JFC 7752 Remote Start Compatible Battery 3.7V 120mAh

Directed Electronics JFC 7752 / JFC 7941 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 120mAh lithium-polymer battery replaces the original cell inside Directed Electronics remote transmitters for the JFC 7752 and JFC 7941 models. These remotes control vehicle remote start and keyless entry functions. No OEM part number exists for this cell — match by model number and physical dimensions: 24.70 x 20.30 x 3.70mm.

• JFC 7752 and JFC 7941 compatibility: Both remotes run the same 3.7V Li-Polymer cell on the same PCB footprint. The connector orientation and cell dimensions are identical across these two models, so one replacement covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under the transmitter's BMS. The protection circuit responded correctly to full charge cutoff and low-voltage cutoff — no thermal events, no BMS lockout during testing.
• Re-sync after battery swap: Directed Electronics remote start systems lose their pairing handshake when the remote loses power. After fitting the new cell, stand within three metres of the vehicle and run the system's programming sequence before testing remote start or entry functions.

Remote start not activating after battery swap

Directed Electronics control modules use a rolling code protocol. When the remote loses power — even briefly during a battery swap — the rolling code counter in the remote resets out of sync with the module. The module rejects commands it doesn't recognise as valid. Run the system's full re-programming sequence from the installation guide to re-sync the remote, then test the start function from close range first.

Reduced range in the first few uses after replacement

Li-Polymer cells ship at storage voltage — typically around 3.6V — not at full charge. At storage voltage, the transmitter's RF output is slightly lower than at a full 4.2V charge. Range normalises once the cell completes its first full charge cycle. Charge the remote fully before expecting maximum transmission distance.