Viper 3706V Remote Start Replacement Battery 3.7V 85mAh

Viper 3706V / 3806V / 4606V / 4706V — 3.7V Li-Polymer Replacement Battery

This 3.7V 85mAh lithium-polymer cell replaces the internal battery in Viper remote transmitters across the 3706V, 3806V, 4606V, 4706V, and compatible series. These are the handheld remotes used to arm, disarm, and trigger remote start on Viper vehicle security systems. Dimensions are 21.50 x 20.25 x 3.56mm — measure your existing cell before installing.

• Cross-series transmitter compatibility: The 3706V, 3806V, 4606V, and 4706V remotes share the same internal battery footprint and voltage rail. That's why one cell covers all these models — the PCB layout and connector position are consistent across this transmitter family.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held voltage steady across the full discharge curve, and the cell reached rated capacity without thermal anomalies or cutoff events.
• Re-sync after battery swap: After replacing the battery, re-program the remote to the Viper control module. Any power interruption to the transmitter breaks the rolling code pairing. Without re-sync, the remote will send commands the module won't recognise.

Remote start not activating after battery swap

Replacing the transmitter battery clears the rolling code stored on the remote's microcontroller. The Viper control module expects a code sequence that's now out of sync, so it ignores the start command — it looks like the remote is dead, but the battery is fine. You need to run the programming sequence from the Viper installation manual for your specific module. Typically this involves cycling the ignition and pressing a button on the module within a set window — confirm the exact steps for your module number before assuming the battery is faulty.

Keyless entry not responding after installing the new cell

A new lithium-polymer cell ships at storage voltage — typically around 3.6V — not full charge. If the transmitter's low-voltage detection circuit flags this as insufficient, commands may not transmit at full strength or at all. Charge the remote via its charging port or cradle for at least one full cycle before testing range. If the remote still doesn't respond, hold the lock and unlock buttons simultaneously near the vehicle antenna to force a rolling code re-sync.