alan_m wrote:
On 02/04/2018 23:09, Theo wrote:
It's a crapshoot, since many of them are fake and die after a short while.
Can you buy an official one from the manufacturer direct?
A lot of the online battery vendors are actually fronts for Chinese
companies, dressed up as UK sellers (so good luck with returns).

The HP laptop is probably made in China with Chinese sourced batteries.

Indeed, almost all lithium batteries are made in China. 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.

Avoid any battery that claims to have greater capacity than the original.

....unless it's substantially larger (eg you can get 9 cell batteries that
project underneath a laptop that previously took a 6 cell battery). However
these can confuse the BIOS/battery management.

Agreed in general though. There's a limit to how much more you can squeeze
in, and a certain tendency for 'hyperinflation' as vendors of fakes try to
one-up each other - eg the '300,000mAh' power banks that are only as large
as 4x 3000mAh 18650s.

Theo