That'd have to be an awfully tiny battery to offer any benefit over the OE unit.
Maybe ounces at best.
Just weighed them both. The CV4 is 2.5 pounds lighter than your OEM
Grom battery, and that's coming high off the bike. Do you really think I'd hawk batteries to save a couple ounces? On top of that, the CV4 has 135CCA vs. your OEM 65CCA. Do your battery research. Lithium ferrous is a whole different animal than conventional batteries.
Per their stats....
Up to 80% smaller than the stock battery
Up to 10lbs Lighter than the stock battery
Service life of over twice a lead acid in similar conditions
Industry leading 3 year warranty
Designed, developed, and assembled in the USA
Completely “dry” technology so batteries can be mounted in any direction
Non-toxic, recyclable, and can be air shipped
Applications for powersports vehicles from 50cc - 2300cc
Tested extensively by professional race teams
Impact and water resistant
Works with the original equipment charging system
No trickle charger required, loses only 10% of charge over a year of static use