Geoffrey S. Mendelson wrote:

I don't understand this business about "low self-discharge" NiMH batteries,
as I'ven never noticed any particular problem with them.

In order to have a lower self discharge rate, they have to have a higher
internal resistance. This lowers the effective charging rate, and the
output current.

I'm using Recyko+ battries sold by GPT out of Hong Kong. They are the
same batteries as one of them (there are only three companies that make
them), but I don't know which.

In order to get them to work, I have to charge them an awfully long time
with the chargers that have a fixed rate. For example the one that came
with the AAA batteries should charge them in 12 hours, I leave them on
at least 24 to get a useful charge. I also have one that times the
charge for 7 hours and I have to charge them twice.

With a normal NimH battery of the same capacity, the charger would charge
it completely in 7 hours.

That is a fault with your charger more than a fault of the batteries. I can
charge LSD NiMH batteries in a few hours in my Maha charger.