If you're looking to create the lightest gaming mouse possible then a battery mod is a must. Switch out the heavier stock battery for a 5g 120mAh battery on any gaming mouse that uses a 3.7v rechargeable lithium battery. This is a very popular mod on the Logitech G Pro X Superlight!

Capacity - 120mAh 

weight - 5g 

voltage - 3.7v