I run a TRF415MSX & the only LiPo i can find to fit is the Team Orion Carbon spec & it has to be inserted at an angle to get it under the bulkhead, mainly because the rear bulkhead is shaped for cells so a brick type LiPo won't fit & you need one with a recess in the top. The CoreRC/Yeah racing LiPo's come with recesses so will go under the bulkhead, but the connector wires stick out the back & depending which way round you insert the battery the wires prevent it going past the rear bulkhead or the wires will get in the way of the steering linkage if you rotate it the other way.
I'm on the lookout to see if the Japanese spec TRF415 chassis bulkheads & top-deck will fit onto the normal spec chassis tray because the Japanese spec 415's are designed to run regular 7.2v NiCad/NimH stick-packs so should accomodate a Lipo much easier.
I've seen a few cars running LiPo's (including the older TRF415's which will take LiPo's easier) that have had the Schumacher Mi2 battery tray fitted as this seems to be a good solution as the tray more or less clamps the battery down & the cells/ LiPo sits more on the chassis than into it, plus it's only a couple of small bolts holding the battery tray on to the car.
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