Hello,

NiMh should have about the same punch overall but will have much more run time over your old cells. I know many are suggesting that you step up to lipos which could be a good move but if you are just bashing around the house and yard and not racing there is no great reason to do this unless you want the extra power and runtime that come from a lipo. This could be a good move but there are many things to consider...

You need to upgrade much of your equipment such as have a lipo compatable charger that can balance charge, have a speed controler that has a cutoff as you cannot run lipos all the way down like you can with NiMh cells.

Make the jump to Lipos is more expensive up front but the cells last well and provided great power, but there is more maintance and with lipos over NIMh cells regarding charging and discharging practices to make sure you keep the cells healthly.

Either way have fun and move at your pace.

Hope this helps.