So much depends on where you are and what you want to do with the car, this year if you are in the UK and want to race to BRCA rules the lipo's are not on the list, next year?
Charger looks to be capable of "auto" charging any lipo you will put in the D4, occasionaly the lipo will need balancing, voltages of the cells matched to a tighter tollerance than just charging, check your charger can do that or add a balancer. Make sure the speed control has a cut off for Lipo, they must not drop below a certain voltage.
Any major make of brushless system will be OK, don't look for to much power, we run a 5.5 Novak in a 4WD car and 6.5 in 2WD, both cars can shift and with lighter Lipo's are faster.
D4 is a good car, have fun.
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