Hi Can any one tell me the best size battery AH etc To run my R&V engine on I have just had a new 6 volt on but the spark out of the coil was not very good Have now got the battery on charge to try again I am trying a 6 volt 10 AH is this going to be able to run All weekend on Regards Nick Nick Banbury (UK) http://community.webshots.com/user/nickholden