[Arm-netbook] Standardized Battery Pack Sizes?

[Christopher Havel]

Phone again, sorry again... 10% of battery height is your minimum space.

On Sep 27, 2017 10:42 AM, "Alexander Ross" <maillist_arm-netbook at aross.me>
wrote:

> On 27/09/17 14:58, Christopher Havel wrote:
> > Typing on phone, please excuse top post.
> >
> > Lithium ion cells are somewhat sedate, but cannot release as much current
> > at once as lithium polymer cells can. Lithium iron phosphate cells are
> > similarly sedare, but have capacities and discharge abilities more like
> > those of lithium polymer cells.
> arr didnt know about the quick and high current discharge of li-po vs
> li-ion. oh and thx for lifepo vs lipo too. thought lifepo could do high
> dischage but didnt know it was simular to lipo. oow i learnt some more
> :) thanks
>
> >
> > Lithium polymer cells are the ones on YouTube that catch fire (or worse)
> at
> > slight provocation. They tend to (pick one) melt, catch fire, or explode
> > during recharge, if the parameters are at all even slightly off.
> >
> > Most phones also use lithium polymer cells, though - usually a single
> > flatpack in a case. These flatpacks need room to expand, whether in a
> case
> > or "non-removeable" inside the phone. What happened with the infamous
> > Galaxy Note 7 was that the designers did not pay attention to this
> > requirement. The batteries tried to expand, couldn't, and shorted out
> > internally as a result. Boom.
>
> Yea tried to leave/naturally left a little bit of room in my wooden
> battery box. hmm guess 1,2or3mm total for front and back and 1cm or so
> along one side with foam to pad/fill the gap. hmm didnt do any
> calculations for how much space to leave. kinda assumed that i had
> enough/ wasn’t trying to make it a tight fit but overall compact. using
> the bits of wood i had for a compact, strong box. its a 4S 20AH pack...
> http://hobbyking.co.uk/hobbyking/store/uh_viewitem.asp?idproduct=80904
>
> you’ve got me reassessing my decisions... hope its ok... got a
> temperature alarm with sensor along the side. plus 2x cell voltage
> monitors/alarms.
>
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