Recommend me a battery for a B4 please.

[Spoolio]

Have decided to dust off the old B4 but need a new battery. As I remember it - it was nearly 2 years ago - the LRP 5300 40c stick I used was so tall that there was no room on top of it to slot the end of my Rudebitz battery bar under the rear tower. So I ran it with the rear end unsupported and put all my faith in the front thumbscrews holding it all in. Don't really want to do this again so is anyone running a thinner Lipo pack with a decent output that they can recommend? Ta.