How to Keep Your Presets during a Battery Swap
Several methods.
Power supply through the OBD port.
Power supply through to the power Jack you use for your phone.
Jumper wires from the old battery to the battery cables.
3 Likes
If you are using the power jack method, be sure that it is active when the key is off.
A search on eBay for memory keepers will show a few suggestions of style.
2 Likes