I use tape to secure the orion 4800 platinum lipo on the chassis. The leads under the battery are OK as well, however if you have more than one type of chassis (like me) they could be a problem to align... and they don't eliminate the need of the tape... another alternative is to use the battery posts that came with the chassis and tape the lipo on the battery brace instead to the chassis...
nevertheless, always put a slice of transparent adhesive (thin rubber foam works better if you manage to get it) over the area between the battery slots, otherwise you will damage you shiny carbon fiber chassis...
The Blue Armada: Tamiya TRF415MSXX, Tamiya TA05MS, Tamiya/Xenon TA05
Novak Brushless, Orion/Peak LiPo batteries, 5-cell
Sanwa M11 DSSS, KO Propo Servos