lipos and esc

[B4 Sloth]

Hello, at the risk of sounding thick can i just use lipos instead of my nimh batteries. I only have one pack of batteries, a 4500 orion rocket pack. Dont laugh...am on a budget. Back when i raced my cobra and meteor i was pleased to updrade to 1200scrs!!!
I need to get more packs to allow me to race. Seeing that you can get 2 5 minute races and more out of a fully charged lipo then this maybe a cheaper option. Seeing a thread about B4s and lipos i thought i'd post this.
I have a nosram patriot reverse. Will this handle lipos?
I have an ansmann charger, the base one that ha digital display and will charger everything.

Thanks