[Arm-netbook] flying squirrel conundrum

[Adrian Carter]

Charger costs missing????
>

Well, the AXP209 PMU does the Charging... either via USB OTG/VBUS or
DCIN... so technically there isn't a need for a wall-wart charger as it
could recharge via OTG.... and the charge circuit itself is all in the PMU
and just requires some current sense lines.


>
>
> This may be off the beaten track in terms of marketing,
> but have you thought about using
> rechargeable AAA, AA or 18650 batteries?
>

AAA/AA provide at best, about 0.2C - meaning that they aren't really any
good for providing more than a few hundred mA peak at a time. High internal
resistance and all that. Even a 2000 or 3000maH NiMh AA or AAA is no
comparison to a 'proper' battery.. most LiPo's can easily do 1C or 2C, and
unprotected ones can go all the way out to near 100C...

They are also probably 3 times the thickness for half the juice.. so would
not reliably work in a flat-pack setup
So whilst 'on paper' using the AA/AAA's is about the same - the reality is
that its a much much much reduced capability solution.

The 18650's are getting closer.. but really.. by then... you may as well
use a bulk purchased LiPo or LiFePo4 and be done with it (particularly
given the form factor differences)


> (If using AA NiMH batteries, it is possible to fast charge them
> in 15 minutes. Need a fan though and more components.
> Again a selling point for a bigger more expensive model
> but still off the beaten track in terms of marketing.)
>


And yes - shorten their life by about 50% in the process... theres a
downside to everything unfortunately :(




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