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I have been reading a lot on this web site about people being unsure about swtiching to lipo batteries. It is all very safe as long as you use the 'C' rating formula. the formula is this battery capacity x 'C' rating = esc amp draw (using mine as an example) 4.000 x 25 = 100 you need to put a decimal point after the first number of you batteries capacity. 4.0 x 25 = 100 if your esc current drain is greater than what your lipo battery can give you are risking a big 'BANG' as long as you follow this simple formula then all will be ok, for those of you out there that are going to say well mine is fine! well its on your head then think of a lipo battery as a bag (cos it is) when it charges it swells, when it discharges it contracts. ESC's with lipo cut off as you know detects the batteries low voltage point. If the battery is taken past its low voltage point it can be damaged, charge it back up again and after a couple of cycles 'BANG' by using an esc that has a higher current drain than your lipo can give this then in effect is taking too much out of the lipo during its 'burst' (the point when you ask for full power) anyway I hope this all helps and settles a few minds. thanks guys, enjoy.