I've had good luck with the eneloops, not sure how to tell if they're counterfeit but they've lasted multiple use over 3 years (I have a toddler so we use batteries like there's no tomorrow)
Good point, I also have Eneloops from Amazon, and they’re fine. Maybe there isn’t enough demand for NiMH rechargeables to be counterfeited? I also bought mine as part of a charger-included pack, which may reduce the incidence further.
