They don't get any lighter than this and they will start a 720ci aircraft engine several times before needing charging.

http://aircraftproducts.wicksaircraft.co...2&keyType=P

1941 Taylorcraft
1968 Charger
1994 Wrangler
1998 Wrangler
2008 Kia Rio
2017 Jetta

I didn't do 4 years and 9 months of Graduate School to be called Mister!