> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Joe Wronski
> Sent: 04 January 2013 01:54
> To: piclist@mit.edu
> Subject: Re: [OT]:: Sheef life ... Sheif lief ... Market your own LiIon 1=
8650
> batteries ..
>=20
> I recently bought 2 (different type) replacement LiIon batteries for Sams=
ung
> phones from eBay.  It was a US seller, and the prices were cheap
> (about $4.00).   They are labelled Samsung and are identical to the
> originals.  Although, the one for my friend appeared to have a marred
> outer label.   The one I tried in my phone seems to perform OK.
> Anyhow, I ran across a tip somewhere about how capacity is related to
> battery mass.  I weighed mine, and the replacement is the same as the
> original.  So I guess I got lucky.  Hope my friend's works as well.
>=20
> Joe W

On a weight related topic, the cheap replacement laptop chargers from China=
 often have woefully undersized transformers in them to cut down costs, and=
 a big chunk of steel glued into the case to make it feel heavy enough to b=
e real.  Nothing really surprises me from China these days; lowest possible=
 cost is the overriding factor for commercial goods, regardless of quality,=
 longevity or even basic functionality.  Sadly this continues to be driven =
by Western culture.

More worrying than the fake Li-Ion cells is the quality of some of the Li-I=
on chargers.  I bought a cheap charger for 2x18650 cells knowing that the c=
harging circuit would be junk; I simply bought it as a reasonably robust ba=
ttery holder to use with a well proven hobby charger.  Out of interest I tr=
ied it on some old laptop cells with a multimeter connected across the batt=
ery, outside on a stone floor.  Once the cells reached 4.3 volts I gave up =
waiting for the charging current to cut off, and needless to say the PCB is=
 now in the bin.

Mike

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