So this was a discussion I had with a buddy over breakfast regarding back up power for an electronic ignition. Off the shelf TCW has their backup battery, so this is about an inexpensive alternative. So the concept is:
Purchase a Dewalt 12 volt power station dock.
Wire it to a two position toggle switch so you can select normal power (also wired to the switch) or emergency power (comes from a Dewalt 12 volt 5 ah battery).
Mount the battery docking station in an accessible location for easy access so you can remove to recharge or check on the charge level (since the battery has a built in indicator).
TCW has a 3ah backup for 260 dollars. You could install a 5ah Dewalt backup for under 100 dollars. And since it is accessible and removable you could carry an extra battery and swap it out with a fresh one.
Really couldn’t come up with a negative issue other then forgetting the battery is there and not checking the charge level. In some ways I think it provides even more redundancy since, theoretically, you could maintain a power source to the EI by replacing the system with a spare fully charged Dewalt battery.
Purchase a Dewalt 12 volt power station dock.
Wire it to a two position toggle switch so you can select normal power (also wired to the switch) or emergency power (comes from a Dewalt 12 volt 5 ah battery).
Mount the battery docking station in an accessible location for easy access so you can remove to recharge or check on the charge level (since the battery has a built in indicator).
TCW has a 3ah backup for 260 dollars. You could install a 5ah Dewalt backup for under 100 dollars. And since it is accessible and removable you could carry an extra battery and swap it out with a fresh one.
Really couldn’t come up with a negative issue other then forgetting the battery is there and not checking the charge level. In some ways I think it provides even more redundancy since, theoretically, you could maintain a power source to the EI by replacing the system with a spare fully charged Dewalt battery.