> On Tue, 27 Jan 2015 22:32:18 +0100, Ruben Jnsson wrote:
> >
> > Unless the charger chip also switches off the battery when discharging
> > and its voltage is too low (around 2.9V if I remember correct), I would
> > also add that function with external components. I did have a quick
> > glance at the datasheet but couldn't find anything about that.
>=20
> I wouldn't use a lithium based battery of any significant capacity (non-
> coin cell) in a product (LiIon or LiPoly) without the protection circuit
> built into the cell/pack. They are readily available and protect against
> over/under voltage and over current typically. Otherwise if the battery
> leads become shorted bad things (tm) will happen and you also protect
> against a cell being over discharged. They also protect against gross
> failures in your charger as well. Won't protect against internal failures
> in the cell/pack but protects against pretty much anything bad externally
> to the cell/pack.
>=20
> Matt Pobursky
> Maximum Performance Systems
>=20

The internal protection circuit is important for overcharging and temperatu=
re=20
but I found that the cut out voltage for these circuits could be significan=
tly=20
lower than recommended (especially with very low current load) and if ever=
=20
going that low, the cut out circuit might not reset when recharging again w=
ith=20
the dedicated charger.=20

/Ruben

--=20
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