Clifford 7541X Remote Battery 3.7V 600mAh Li-Polymer

Clifford 7541X — 3.7V Li-Polymer Replacement Battery

This 3.7V, 600mAh lithium polymer battery fits the Clifford 7541X remote start and keyless entry transmitter. It restores wireless vehicle start, door lock, and unlock functions when the original cell has depleted. Dimensions are 41.16 x 29.70 x 5.00mm — verify against your existing cell before ordering.

• Clifford 7541X transmitter fit: The 7541X uses a slim Li-Polymer cell at this exact voltage to maintain the low-power RF circuit and rolling code memory. A voltage mismatch here causes the transmitter to appear dead even with a charged cell installed.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the bench. The protection circuit tripped correctly at the low-voltage cutoff and accepted charge cleanly from a CC/CV source at 4.2V termination.
• Re-sync after battery swap: Clifford remote start systems lose their link to the control module when the transmitter loses power. After installing this battery, run the 7541X programming sequence — typically holding a button combination near the vehicle — before expecting remote start to respond.

Remote start not activating after battery swap

The 7541X control module authenticates the remote via a rolling code handshake. Swapping the battery resets the transmitter's session state, breaking that handshake even if the new cell reads full voltage. The module will ignore commands until the transmitter is re-paired. Clifford's re-sync process requires you to enter programming mode on the control module — consult your 7541X installation guide for the exact button sequence, which ends with the parking lights flashing to confirm pairing.

Reduced range immediately after installing a new cell

A fresh Li-Polymer cell ships at storage voltage — typically around 3.6V — not at its full 4.2V charge. At storage voltage, transmit power is slightly lower, which shortens effective range. This is not a fault with the battery or the transmitter. Charge the transmitter fully before use and range will normalise — full charge on a 3.7V Li-Polymer cell reads 4.2V at the terminals.