> How much of that is down to the quality of the cells and how
> much down to the quality of the charger I wonder?

I know Russell has had experiences with Chinese batteries, and
the expectation is, rightly or wrongly, that they aren't top-notch.
ISTR Russell's turned out to be fakes. It might well be that a
better charger would improve the lifetime. I must say that the
chargers that come with many of these tools are basic (my 18V
B&D Predator has just a barely-regulated 24V plugpack), and
that batteries do seem to go flat rather quickly. Probably worth
looking into

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