really depends on the shape of the unit. i find my trusty m8 just like an old glove (or girlfriend ), far simpler to adjust settings and has only the settings i want to use. my m11 i am finally starting to use more (arluck laugh away if u want) after 2yrs of sittin in the bag (how said is that, but its true?). springs on m8s do give out, they are replaceable but its down to the unit itself and how its cared for.

i think u'll find instead of makin a conversion (some homemade work) for a lipo in the m8 might steer u to the m11 which a lipo for can be had for 20bux online and plugs right in.

R