I have my batteries set to discharge after 5 days. Since I haven't flown in that time I checked them today and two of the six were what I'd call 'very warm' (not hot). This happened to one battery two weeks ago and it flew fine after charging. The two warm batteries currently appear to be charging fine. Has anyone else noticed 'warm' batteries when they are in discharge state? Are there any potential problems with this or can it be considered normal? Thanks!