Ruddybloke I think that should have been a "used to come with ripmax's own crappy batteries". My 2 year old EXA suffered with 'black wire' after 16 months or so. Same as you, another problem stopped me from flying and its when investigating this problem I noticed a bit of leakage from the battery. When I stripped back the neg wire I saw the "rot", my 6 month old EXA has Sanyo batteries in it.