Re: [WIP] Power Half (2000 mAh)
 

No problems during my 15 min test. Only that Sparkfun board got a bit hot, could not touch it.

Re: [WIP] Power Half (2000 mAh)
 

Okay, did you go to 100% charged?

Re: [WIP] Power Half (2000 mAh)
 

Battery charged from 54 % to 63 % if remember right during the test.

Re: [WIP] Power Half (2000 mAh)
 

pogo pins? with 2 pulolo boards works good and charge, too. It is only little bit hot. I think its to hot if you have the phone in the pocket from your pans :D ... maybe good if its winter.... maybe we can say, that it is a winter feature :p

Re: [WIP] Power Half (2000 mAh)
 

Got yesterday those boost converters from China. From my endless scrap box I harvested Sparkfun single cell LiPo charger.

I modeled last night the Power Half 3D model (EDIT: https://github.com/skvark/TheOtherHa...epowerhalf.stl) and printed it today. Rest of the stuff was just pretty much soldering and gluing.

There's a power on/off switch at the bottom right side (there's inset so you can't turn it on or off accidentally) and USB terminal for charging.

Charging will light up bright led in the bottom left corner. When power is on there's less bright led at other side. Those leds are embedded to the Sparkfun board and to that boost converter board.

The power switch cuts the power between those two boards so the setup works in these modes:

1. Charge the phone only from the Power Half
2. Charge the Power Half only
3. Charge both simultaneously

CSD tool shows -780 - -790 mA charging current. The boost converter gets a bit warm but not too hot.

Costs for this setup were around 32-35 USD (23-25 EUR). Can be lowered by designing all-in-one board which has LiPo charger circuit + 1A 3,7 V -> 5 V boost converter. Unfortunately I don't have time to do it :)

Parts:

- Sparkfun single cell LiPo charger
- 1 A boost converter
- Copper tape
- 2000 mAh LiPo
- wire
- some SPDT power switch or something else

Pictures: http://relativity.fi/jolla_power/

http://relativity.fi/jolla_power/power8.JPG

Re: [WIP] Power Half (2000 mAh)
 

If you ever get the sudden urge to produce and sell these, don't fight it. I'd sign up for one :)

Re: [WIP] Power Half (2000 mAh)
 

Short demo: https://vimeo.com/88590219

Re: [WIP] Power Half (2000 mAh)
 

I want this so bad!! It looks really awesome... I need it for my looong trips.
Are you thinking about producing at big scale? I mean,the final version

Re: [WIP] Power Half (2000 mAh)
 

I don't have resources or time to produce these on large scale :( But that's why I provided part list, 3D model and other info so you can build one yourself.

Re: [WIP] Power Half (2000 mAh)
 

Thanks for all the info and hard work. Please keep us updated on how it's working out (charging/battery time/other quircks...).