Viper 7752V Remote Start Compatible Battery 3.7V 120mAh

Viper 7752V Series — 3.7V Li-Polymer Replacement Battery (GEB402025)

This 3.7V 120mAh lithium-polymer cell replaces the GEB402025 battery inside Viper remote fobs including the 7752V, 7351V, 7752P, and 7752X. It powers the handheld transmitter used for remote start, lock, unlock, and alarm control on Viper-equipped vehicles. The cell measures 24.70 x 20.30 x 3.70mm — confirm your fob dimensions before ordering.

• 7752V, 7351V, 7752P, 7752X fob compatibility: These transmitters share the same PCB footprint and connector layout, drawing power from a single Li-Polymer cell at 3.7V nominal. One cell swap covers all models in this group without circuit modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on compatible fob hardware. The BMS held stable voltage across repeated button-press loads, with no drop-out events detected during testing.
• Re-sync after replacing the fob battery: Viper remote start systems lose their pairing state when the fob loses power entirely. After fitting this cell, stand within three metres of the vehicle and run the transmitter programming sequence outlined in your Viper system's installation guide — the fob will not trigger remote start until that sequence completes.

Remote start not activating after battery swap

Viper remote start modules use a rolling code protocol between the fob and the control module. When the fob battery dies completely, the rolling code counter in the transmitter resets, putting it out of sync with the module. Pressing the start button will appear to do nothing — the module receives the signal but rejects the code. Re-enter programming mode on the control module, then press the button sequence on the fob to re-establish sync; the exact steps vary by installer but typically involve turning the ignition to the on position two to three times within five seconds.

Reduced range immediately after fitting a new cell

Li-Polymer cells ship at storage voltage — typically around 3.6V — not full charge. At storage voltage, RF transmit power from the fob is slightly lower than at a full 4.2V, which shortens usable range. This is not a fault with the cell or the fob. Charge the fob fully via the vehicle's charging cable or cradle before judging range; after one complete charge cycle, output voltage stabilises and range returns to normal.