From: David C Brown <dcb.home@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 6 Oct 2020 12:36:33 -0700
Subject: Re: [EE] Re: Lithium battery confusion.
Thread-Topic: [EE] Re: Lithium battery confusion.
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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 be
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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