I stick to the K.I.S.S. metheod of battery management:
I use 1200 mah nicads for .40 size, 270 mah nicads for .15
size and smaller. My nitro cars get 6.0v nimh packs from
Trinity. I check the voltage every few flights, and charge
when nessessary. I replace packs every few years. In fact,
I have three packs I'm rotating out at the end of this flying
season. I have never had an in-flight battery issue in nine
years in the hobby.[sm=shades_smile.gif]