You can never have too many batteries! I found energiser batteries to have a decent lifespan. So glad ATM sells batteries makes it easier to get an extra set when purchasing a battery operated toy rather than have to grab some in the supermarket when ya kids complain that the batteries are for you not there toys. Winning!
have a good battery life, no awkward running out in the first session :)
Need batteries? Get these ones
Nuf' said