Can I Upgrade Airsoft Battery Voltage ?

I have an airsoft with a battery of 7.2 V 500mh and I wanted to know if I could put a battery with higher voltage like 8.4V because I cant find 7.2 V battery on the internet. I want my airsoft to shoot faster and further So, would it work or the gears (plastic) will destroy?

Patented (author) 7 years ago
ok I know I can now