16 Volt Battery ?

[Dragsinger]

a fully charged 16 volt with the load your explained will make at least 5 runs without charging.

Of course, when time allows, charge between rounds. We race two cars with one 16 volt charger, just rotate between cars every 2 - 3 run

I like the 16 volt upgrade, it gives me a smile every time I engage the starter. I like buying from Make Payne at House of Payne. he sells the Rock brand.