I recently noticed fatigue cracks on my P4P lower shell on 3 arms near and through the vents. I purchased this new in March and the batteries total 73x2 cycles. I also have a P3P which has much more time with zero issues. My question is if I decide to repair this issue does this void any warranty I may have? and does the regular P4 and P4P use the same lower shell? My P4P has had zero abuse and zero impact. I was just reading how inadequate these P4 shells seem to be. Also is there a particular PVC or other agent that's known to be good on these plastics? Thanks!