I had issues with regular alkaline batteries. Brand new battery would give low battery sign as soon as GPS was hooked up. I switched to lithium battery and I have 3 race weekends on same battery and still going. Order lithiums from battery junction, much cheaper than picking them up in a store.
I’m using a 3s Li-Po RC car battery to power Mychron 4 and GPS. It’s 11.1 volts and it charges to about 11.9 volts. It’s been great, lasts so much longer than a 9 volt. No more buying a 9 volt for $6 at the gas station I forgot to get one earlier. Here’s a link to the one that I have.
Yes. Connected to the power leads on the 2 port data hub that comes with the GPS. I bought a couple of the female plugs would plug in the existing plug on the battery and put flat blade connectors on to plug into the Mychron wiring.
I decided to go this route because of how quick the Mychron with GPS would run down a 9 volt.