Last years it becomes more and more difficult to purchase a 9V alkaline type in any store, it is no longer a permanent sell, and once appears the price is shameless high.
I need one for my Metex M-4630 and I decided to order 500mAh like this:
From what I know, there is a charger and Step up inside. See pictures here.
Well, I think that this one is fishy (how it can be 4800?)
Has anyone here actually used a 9v Li-Ion USB battery?