I got a fantastic price ($40) for an InduraPower LiFePO off ebay. Seems the company was going out of business and liquidating assets.
That battery needed some terminals and cables to hook up to the existing FFE battery cables. After that was done it worked with the car flawlessly.
However, one of the selling points of this battery was its Bluetooth connectivity, configurability, and control through the app. That aspect of the battery was not ideal. Yes, its cool to see the current draw and voltage of the battery on the phone, yes it is cool to be able to turn down the supplied current so that only clock and radio memory is saved, and the car cannot be started. Definitely a theft deterrent. Yes its nice that there is an advanced BMS in the battery and a heater and other features, and that it is supposedly made in Mesa, Arizona. But, when you look at the app, and it shows that you are losing 5% battery capacity every day the vehicle sits unused, you get concerned. The battery seemed to behave fine, but the software was misleading.
I felt uneasy leaving the battery in the FFE and moved it to my chevy metro. Well, waddaya know, the software is happy with that. The metro sat for 2 weeks in stupid hot conditions, and the app showed the battery lost only 1% the entire time. What gives?
And yes, I have set the battery out on the floor overnight and have seen it lose the 5% over a 24 hour period. While at the same time, showed that it was being charged out of thin air. So its not the FFE causing the problem. But maybe the fact that the FFE does not have a high current draw (starting), and the software in the battery needs to see this current draw. Dunno.