From: Denny Esterline <desterline@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 6 Oct 2020 12:55:01 -0700
Subject: Re: [EE] Re: Lithium battery confusion.
Thread-Topic: [EE] Re: Lithium battery confusion.
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Don't know about your side of the pond, but around here I can get Amazon
Prime, sometimes the same day. They can get me these:
https://www.amazon.com/Mudder-Pieces-Charging-Battery-Protection/dp/B087Q91=
5LF/
20 pieces for $10 US.
Many other options available in the same approximate price range.

-Denny




On Tue, Oct 6, 2020 at 12:37 PM David C Brown <dcb.home@gmail.com> wrote:

> Thanks for that.
> Yres the ADAFRUIT charger is expensive but I can have one on Thursday
> rather than waiting six weeks for one to come from Asia and turn out to b=
e
> mechanically incompatible.  Go the teeshirt on that.
>
> __________________________________________
> David C Brown
> 43 Bings Road
> Whaley Bridge
> High Peak                           Phone: 01663 733236
> Derbyshire                eMail: dcb.home@gmail.com
> SK23 7ND          web: www.bings-knowle.co.uk/dcb
> <http://www.jb.man.ac.uk/~dcb>
>
>
>
> *Sent from my etch-a-sketch*
>
>
> On Tue, 6 Oct 2020 at 19:54, Dwayne Reid <dwayner@planet.eon.net> wrote:
>
> > Topic tag added
> >
> > Russell M is probably best to answer this but I'll pass on what I've
> > learned over the years.
> >
> > As far as I know, standard Li-Ion and Lipo cells have almost
> > identical chemistry.  There used to be a slight difference between
> > cells from different manufacturers in the anode material used.  This
> > lead to different nominal voltages (3.6V xs 3.7V) where the maximum
> > charge voltage was 4.1V for the 3.6V cell and 4.2V for the 3.7V cell.
> >
> > Also as far as I know, most Li-Ion and Lipo cells are now of the 3.7V
> > nominal voltage version.
> >
> > Do note that I am NOT talking about the LIFEPO4 cells (3.2V nominal).
> >
> > The charger module that you linked to seems entirely
> > appropriate.  Stupid expensive, though.  There are far less expensive
> > ready-made chargers available from Oh So Many Asian suppliers.
> >
> > Or - you could roll your own with free samples from Microchip.  I use
> > their MCP73831T-2DCI/OT in two of the products that we have built in
> > the past.  Less than Can $0.50 in 25 lot or free if you ask Microchip
> > nicely.
> >
> > dwayne
> >
> >
> > At 11:01 AM 10/6/2020, David C Brown wrote:
> > >I have cell phone  battery from a reputable manufacturer - Motorola -
> > which
> > >is marked
> > >3.8v Lithium Ion Polymer battery.  And I am seeking a charger module.
> > >
> > >I was under the impression that Li-ion and Li-poly were different
> > >chemistries which require different charging regimes.  Is that not so.
> > >
> > >And would this simple module https://tinyurl.com/y48gp4hu be suitable.
> > >__________________________________________
> > >David C Brown
> > >43 Bings Road
> > >Whaley Bridge
> > >High Peak                           Phone: 01663 733236
> > >Derbyshire                eMail: dcb.home@gmail.com
> > >SK23 7ND          web: www.bings-knowle.co.uk/dcb
> > ><http://www.jb.man.ac.uk/~dcb>
> >
> >
> > --
> > Dwayne Reid   <dwayner@planet.eon.net>
> > Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> > 780-489-3199 voice   780-487-6397 fax   888-489-3199 Toll Free
> > www.trinity-electronics.com
> > Custom Electronics Design and Manufacturing
> >
> > --
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