My lipos are standard roundies yet the fit was too tight i had to use 4mm spacers and longer screws to fixed end piece so that the quick release would close properly. Having done that i love it. i have had many tumbles with the M05 but not lost a battery.
Much easier to use than the standard kit holders.
This is a nice hop up from Tamiya, it's easier then the stock battery holder -> you don't loose your "expensive" clips anymore! and it's carbon!!!! Carbon = cool ;) So nice hop-up for your money.