Thanks guys

Idea is to be portable and when I go racing 1/28’s id rather not take my PS and charger etc so has thought as the Lipos I use are 2S 360mah I could take a decent size 4-6S and just charge them at my work table.

For my other use the smallish car battery would be a good idea, gutted as I had an awesome car audio dry cell battery I had from my competition car audio days I gave away a year or so back 🤦🏻‍♂️