>
> That is a good way to destroy the battery early or very early or very very
> early.
>
> I'll add this here after writing the material below first :-).
>
> An easy way to get a good result is to but a TP4056 module from
> ebay/AliExpress/... .
> These cost close enough to $0 to be hard to beat.
> You can get ones with and without low battery cutoff. The with-cutoff
> ones are a very good idea.
> Distinguishable by some extra hardware and 4 output pads - Vout + - and
> Battery + -
> You get CCCV charging, CC rate settable and low battery discharge terminate.
>
> They seem to have got even cheaper than when I last bought some.
> This page has both types as above - plus it seems mini/micro/type C USB
> power input connectors.
> Example only - not a recommendation - but seems as good as most. YMMV.
>
> https://www.aliexpress.com/item/4000061318186.html?
>
> They also offer a version with a switchmode converter allowing a higher Vin
> (typically up to about 18V rather than the 6V or so for TP4056)
>
>
> ________________________
>
> Simple methods are used "because they can".
> The cell MAY have an internal BMS to sort-of protect it.
> MAy.
> ________________________
>
> LiPo / LiIon should be charged by CC to Vmax with *immediate* terminate,
> or, more usually, CCCV with CC to Vmax, and CV to some CC/N value. N=2 2 is
> a good charge, n=4 is heavyish and N=10 is "road warrior".
>
> CC only at mA = cell_mAh with immediate terminate at Vmax gives 89-90% of
> max capacity and
> CC at mA = mAh_cell/2 gives 90%+ of max capacity.
> Immediate terminate at V=Vmax gives significant gain in cycle life and
> whole of life mAh.
>
> Lowering Vmax slightly gives significant increase in cycle life  and whole
> of life mAh.
>
> FWIW - nobody wants to do it - setting Vmax to about 3.85V (from memory)
> allows Mars Rovers to get about 8000 cycles with LiIon. Capacity (from
> memory) is about 50% of max.
>
>
> Russell
>
>
>
>
>>
>>

> No worries.
>
> A careful constant current discharge curve should tell you if there is
> a pack protection circuit.
>
> Or show us a picture of the battery, terminal ends.
>
> Pack protection circuits are always outside any metal-coloured polymer
> envelope, ... in my experience.
>
> I've a roughly 180 mAh cell here from a cheap product with pack
> protection hidden under tape.
>

> Thanks James,
>
> Below photos show front and back of the battery. As you can see it is
> hard to see any evidence of built in circuitry.
>
> https://drive.google.com/file/d/1P8dJ0InRqHxucISwHr60a313GkWGCae0/view
>
>
> https://drive.google.com/file/d/1mC-NPQWxzKda2GRVbrfEXOf_e5FTkDvL/view?usp=sharing
>
>
>
>
> > No worries.
> >
> > A careful constant current discharge curve should tell you if there is
> > a pack protection circuit.
> >
> > Or show us a picture of the battery, terminal ends.
> >
> > Pack protection circuits are always outside any metal-coloured polymer
> > envelope, ... in my experience.
> >
> > I've a roughly 180 mAh cell here from a cheap product with pack
> > protection hidden under tape.
> >
> --
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>

> It has been "puffy" since I got it. It isn't warm at all when charging
> so I think it's ok. About to change it out anyway however.
>
>
> > It's not just you; but I couldn't be sure from the angle of view and
> > not knowing angle of lighting.
> >
> > On Fri, Sep 04, 2020 at 05:51:18PM +1200, Ryan O'Connor wrote:
> >> Is it just me or is that battery swollen to the point where it might
> >> explode?
> --
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>

> Agree on theTP4056 boards, excellent value for money, I buy the TP4056/DW01
> charge/battery protection boards in packs of ten these days as they're
> really handy for throwing together a quick Li-Ion battery pack for portable
> gear.
>
> An example:
>
> https://www.ebay.co.uk/itm/5PCS-5V-Micro-USB-Lithium-Battery-Charging-Board-Charger-Module-1A-18650
>
> I've also found a variant which doesn't have the DW01 battery protection IC
> but does have the TP4056 and a boost converter which can provide outputs up
> to a claimed 12V/2A (I'm pretty sure it won't give 2A at 12V but it still
> looks very useful)
>
> https://www.ebay.co.uk/itm/USB-18650-Lithium-Li-ion-Battery-Charger-Module-Boost-3-7V-to-5V-9V-12V-New/
>
>
>

> It has been "puffy" since I got it. It isn't warm at all when charging
> so I think it's ok. About to change it out anyway however.
>
>
> > It's not just you; but I couldn't be sure from the angle of view and
> > not knowing angle of lighting.
> >
> > On Fri, Sep 04, 2020 at 05:51:18PM +1200, Ryan O'Connor wrote:
> >> Is it just me or is that battery swollen to the point where it might
> >> explode?
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

> Hijacking the thread, I have a question about the battery in my mobile
> phone. I'm careful about charging, and want to get as many useful years of
> life as possible out of the battery. I try to never let the battery get too
> low, never charge the phone if it's hot, and never let it charge fully.
> Based on the phone's gauge, I charge it when it's down to 40% and take it
> off charge when it reaches 80 or 85%. I think this is probably a pretty
> good way of doing it. I plug the charger into a timer so I don't have to
> watch it, I'm not totally OCD :)
>
> My question regards preferred charging current. The charger that came with
> the phone will do my normal charge regime in about 20 minutes. The good
> quality charger from a previous phone will take 90 minutes to do the same
> thing. Neither charger noticeably heats the phone.
>
> Which is easier on the battery, high current for a short period of time,
> or medium current for a longer time, both taking the battery from 40% to
> 80% state of charge?
>
> Thanks, Bob
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

> Hijacking the thread, I have a question about the battery in my mobile
> phone. I'm careful about charging, and want to get as many useful years of
> life as possible out of the battery. I try to never let the battery get too
> low, never charge the phone if it's hot, and never let it charge fully.
> Based on the phone's gauge, I charge it when it's down to 40% and take it
> off charge when it reaches 80 or 85%. I think this is probably a pretty
> good way of doing it. I plug the charger into a timer so I don't have to
> watch it, I'm not totally OCD :)
>
> My question regards preferred charging current. The charger that came with
> the phone will do my normal charge regime in about 20 minutes. The good
> quality charger from a previous phone will take 90 minutes to do the same
> thing. Neither charger noticeably heats the phone.
>
> Which is easier on the battery, high current for a short period of time,
> or medium current for a longer time, both taking the battery from 40% to
> 80% state of charge?
>
> Thanks, Bob
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

> Hijacking the thread, I have a question about the battery in my mobile
> phone. I'm careful about charging, and want to get as many useful years of
> life as possible out of the battery. I try to never let the battery get too
> low, never charge the phone if it's hot, and never let it charge fully.
> Based on the phone's gauge, I charge it when it's down to 40% and take it
> off charge when it reaches 80 or 85%. I think this is probably a pretty
> good way of doing it. I plug the charger into a timer so I don't have to
> watch it, I'm not totally OCD :)
>
> My question regards preferred charging current. The charger that came with
> the phone will do my normal charge regime in about 20 minutes. The good
> quality charger from a previous phone will take 90 minutes to do the same
> thing. Neither charger noticeably heats the phone.
>
> Which is easier on the battery, high current for a short period of time,
> or medium current for a longer time, both taking the battery from 40% to
> 80% state of charge?
>
> Thanks, Bob
>

> Not on this particular product, but I've been able to reduce fast
> charge to slow charge by lowering the voltage.  Simplest by adding a
> USB extension cable in series.
>
> --
> James Cameron
> http://quozl.netrek.org/
> --
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>