Well, thanks guys for your replies!
This is the battery I have:
http://www.apexmodels.com/gbu0-prodshow/101941.html
Yes, I have a fusion charger, set to LiPo, 0.5A 2S. Charged at this slow rate from new (2 weeks ago). Balance charged.
Perhaps I will see if I can return to the retailer. So is a reading with a multi meter of 7.5v after a few minutes low? Any links to any recommended straight fwd fit batteries?
Shocks - so I need to take them apart and fit some tubing. 3mm internal diameter? Anyone have a link to instructions and fuel tube required? I though about running a die up the shaft and cutting it down - recommended or a silly idea?
Thanks again