wanting to upgrade servos and power supply. i have a cheap LiPo 3s i believe. can i usew that and add in a step down of some description ? is this what you experianced guys do? I understand enough to be dangerous so any advise banter or critasisum is welcome . i should add. HPI save 4.6 old school salvaged from the shed. pic is a battery i have that was for a boat i built