I've used a lot of batteries for my flash. I am always noticed that the batteries lose their charge more or less quickly. I need my flash maybe every month and it is very often happened that cheap batteries either were already over-discharged or had only small power. On the recommendation of a friend I bought eneloop me half a year ago and I have to say that quasi occur no more discharges. The batteries last for half a year without having to be reloaded.
In my household, I have already been equipped with all remotes Eneloops and all function like the first day.
