Sanyo Eneloops. Never false on me. Long battery life also, I can do a full day shot with only a set of them.
i've used GP, Powerex, Sanyo and now Sony.
GP is not as good as it seems. the first few times its good but after that it gives way... The Recyko which is like the Imedions and Eneloop lacks the punch. it's rated at 2100mah same as the imedions and eneloops if im not wrong but doesnt recycle as fast. thats what i feel
Sanyo. never owned the 2700mah ones so cant comment. however the imedions feel good. retains its charge well and gives that punch when you need it. recommended
POwerex. I;ve a dozen of these 2700mah bbut only 4X are still "alive". they can take abuse very well and live up to its expectations. i'm saving up for a charger with refresher function to revive my batts. The imedions live up to its name.. a contender to the eneloops. recommended too
Sony , just bought recently, looks good but can comment yet. so far feels like a sanyo and powerex. gonna shoot more before commenting
Thanks to both catohcat and NeTHaCK for your replies to my questions.
So it seems like the charger also makes a difference. Any chance that the Maha charger with refresh function can refresh batteries other than the Imedion Powerex brands, NeTHaCK? (e.g. Energizer, Sanyo etc. etc..)