On Tue, 31 Jul 2018 13:21:56 +0100
The Natural Philosopher  wrote:

> NBone of the hundred or so LI-Ion batteries I have had have outlasted my
> car battery.

 That's hardly surprising, car batteries spend nearly all their life
fully charged and only discharge a little (admittedly at very high current
for a short time) when starting the engine. Their chemistry and mechanical
design is optimised for this load pattern.

> 500 cycles is usially the half life (down to half capacity) or a lot
> less if exercised heavily.

 Try comparing them with deep cycle lead/acid batteries with a
similar usage pattern, then remember that there are a *lot* of crap Li-Ion
batteries on the market so make sure you are comparing similar quality
products designed for similar use.

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