No worries mate, its always best to ask if you not sure :)
If i was you though mate i would 100% buy some better batteries, batteries with a higher Mah rating will take longer to charge but you will have a much longer run time, with say using a 3700+mah battery..
heres a good battery mate for a great price :thumbs_up:
http://cgi.ebay.co.uk/7-2v-NiMH-3700mAh-Re...=item3359933f03buy that and your run times will nearly double :thumbs_up: