The Natural Philosopher wrote:
On 03/04/18 13:04, Theo wrote:
The distinction is
between branded batteries which have a well-controlled chemistry and last
for 1000 cycles, and poor construction/chemistry that last for 200 cycles.
Or fakes (rejects, bad materials, poorly tested, etc) which last for 100
cycles and possibly lie about capacity.

Er no. It's a lot more complicated than that. There are issues like peak
discharge rates and peak charge rates and self discharge rates, as well
as size and weight and capacity and lifetimes.

Indeed - every manufacturer has a range of cells: a laptop is different from
a power tool is different from an electric car, and there are models to suit
each application. You need the right part for the job, like any other
product.

That is entirely orthogonal from the fact that there are fake batteries out
there, which pretend to be the real thing but don't obey the datasheet, and
low quality manufacturers who don't have a datasheet in the first place.
Both kinds you want to avoid.

Theo