I have IP5400 (60C). Come to think of it, I have changed batteries since I ran the xx4 last year. I used to have a set of 2 year old IP 4200s in that one so that might have something to do with it. I also realised I could cut the back of the side scoops to let more air out and if that's not enought, I have a Jconcept body on the way that might do the trick.
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