As above lipo would be the better and cheapest option even after buying a new charger. Im guessing if you last used nicads your charger would be quite slow re max charging amps and maybe not suitable for nihm,s. Plus you sound like your giveing lipo some thought so why not just go straight in. If it doesnt work out you can resell lipo easily, nihm would be hard to sell and storage is a pain.
Nihm should really be discharged on a balancer tray after every use to get the best out of them and prolong their life. They dont usually recomend charging more than 2 times in 24 hours. One set would not be enough.
As bigred says a single lipo pack can be used and topped up all day.
And you wont have the boring waste of time spent discharging 3-4 packs of nihm batteries before recharging. Plus you will get a real differance in the power from lipo.
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