zx5 help!

[bod405]

New to the site so first off hi to everyone.

Had couple of tamiya kits when i was younger and fancied another go at rc so Been and got myself a zx5 rtr seems pretty good out the box but was wondering if anyonr could recommend a good battery/cell and charger to use not goin to be racing......yet, just round the local parks etc

and maybe a new motor for abit more speed
Been lookin online and just gettin more and more confused