with my sptwks engines it is a little overkill . the werks and novarossi engines in particular can use the extra voltage(very tight pinch) . im looking at picking up a couple more very tight engines that the extra power is needed as well . I kept reading these guys talk about the 4s in boxes and at the same time struggling with losi boxes and also the pinch in some engines I was leaving the stuff at home cause the things were a pain to mess with . its just super nice to know that theres not 1 engine or maintnance with a gel as well as weight of gel cell thats gonna interupt a day of racing . that rossi engine and werks running in the same day killed my starter boxes with gel . the extra power its litterally a bump(little push) to start an engine(makes it super nice)