Autostart ASRS-7504 Remote Start Compatible Battery 3.7V 85mAh

Autostart ASRS-7504 / 7506AS / AS757 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 85mAh lithium-polymer cell replaces the factory battery inside Autostart remote transmitters for the ASRS-7504, 7506AS, and AS757 systems. These are vehicle remote start and keyless entry fobs — not a module or under-hood component. When the original cell depletes, the remote stops sending commands to the control module entirely.

• ASRS-7504, 7506AS, and AS757 compatibility: All three remotes share the same slim Li-Polymer cell footprint at 21.50 × 20.25 × 3.56mm. The voltage rail and connector type are identical across this transmitter generation, so one cell covers all three models without modification.
• Bench tested on actual hardware: We cycled this cell under the pulse-draw profile typical of RF transmitter bursts. The BMS held stable voltage through repeated short-duration command transmissions with no dropout or cutoff trips during testing.
• Re-sync after battery swap: Autostart remote start systems lose their pairing state when the transmitter loses power. After fitting the new cell, run the system's remote programming sequence — typically holding a button combination within range of the vehicle — before expecting the remote start or door lock functions to respond.

Remote start not activating after battery swap

Aftermarket remote start control modules use rolling code or fixed-code pairing that must be re-established after any power interruption to the transmitter. Fitting a fresh cell resets the remote's communication state, so the module ignores commands it can't verify. The fix is a programming sequence — usually pressing a specific button combination within a set distance of the vehicle while the ignition is in a particular state. Consult the ASRS-7504 or AS757 system manual for the exact sequence, as the step order matters.

Reduced range immediately after fitting the new cell

A Li-Polymer cell ships at storage voltage — typically around 3.6V — not a full 3.7V charge. RF transmitter output power is directly tied to cell voltage, so range will be slightly shorter until the cell reaches full charge through normal use cycles. Most users see range normalise after three to five uses as the cell settles. If range stays short after that, check that the cell contacts inside the fob are clean and making full contact with the battery terminals.