[WIP] Extended Akku Other Half
 

Hello friends, i want to start a project and i need some informations about the connectors. I dont get my jolla phone yet, this is why i need your help :)

I buy a Motorola RAZR MAXX Accu (EB40 - 3200mHa).
Want this builed in my second TOH Backcover.

i hope you guys know the information, or can find out them :)

is it on the picture the connection to plug a extended battery? If yes, wich one is + and - ?
and i need the dimensions from the connector, if some one have little bit time to check itfor me?

http://i41.tinypic.com/vsf0ia.png
http://www.intouchwireless.ca/image/...ry-800x800.jpg
http://i40.tinypic.com/5p52k2.jpg

Re: [WIP] Extended Accu Other Half
 

http://www.pasteall.org/pic/show.php?id=63234

Re: [WIP] Extended Accu Other Half
 

I asked similar question and the response was that I2C does not support charge transfer, it should be done via USB. So it would be nice if those pins are USB pins, but if not you have to use external USB cable to plug the new battery in phone's main USB port. ;)

Re: [WIP] Extended Accu Other Half
 

ok thanks i updated first picture. than i need the another infos :)

i hope there will charge both accu´s in same time.

Re: [WIP] Extended Accu Other Half
 

the 3. pic is old... one month ago we had no infos. but maybe there are 2 pins for the battery. i hope! and i dont want a second accu to.change ;) why the easy way if can take the harder way ? :p

Re: [WIP] Extended Accu Other Half
 

Oh man, so many user have the smartphone and no one has time time to get a Linial?

Re: [WIP] Extended Accu Other Half
 

so i get my eb40 accu, i have now the dimensions:

http://i39.tinypic.com/2808t9t.png

Re: [WIP] Extended Accu Other Half
 

How about this idea?

Slightly adjust your OH with some magnets or whatever and have multiple batteries laying around (and charging ofcourse!) Put a power converter to 5v with micro usb port on the detachable battery!

Re: [WIP] Extended Accu Other Half
 

look interessting, but i don´t want a extra case for the jolla phone, because it is fat enough :D
And i think 3200mAh (+2100 = 5300mAh) is enough to use the phone for 1,5 - 2 Days :)

Re: [WIP] Extended Accu Other Half
 

i see DC=5V, it is for a charger like wireless or solar.
But what happend if i connect a 3,8V Accu? it will be not charge the internal accu, i know that, but will be give extra power if the internal accu is empty??

Re: [WIP] Extended Accu Other Half
 

Behind that 5V input there is likely a voltage regulator.
If the internal circuitery requires at most 3.3V, with 0.5V difference it could just make it if it's a 'low dropout' type. However I'm afraid that as the input is supposed to power everything AND recharge the battery, a 3.8V source would be considered under the minimum and would not be used at all.

Re: [WIP] Extended Accu Other Half
 

hmm ok, than i have do maybe a another plan. Maybe a solution without the internal batterie and only the 3200mAh accu.

Or a thin board I can put between the internal battery and this connected to the external accu. But the question is what happens when you connect two batteries in parallel. If both batteries loaded properly?

Re: [WIP] Extended Accu Other Half
 

http://faithfamilyfreedom.com/wp-con..._explosion.gif

also, google for "connect li-ion batteries in parallel"

(spoiler alert: bad plan! read this)

Re: [WIP] Extended Accu Other Half
 

I wouldn't be so resolute. People connect batteries in parallel all the time. See for example this thread, it contains diagrams of how to do it with the N900 batteries (the trick is to use the chip from only one of them). And my old laptop used 8x18650, four times two in parallel.

Re: [WIP] Extended Accu Other Half
 

small update...

http://i43.tinypic.com/5clw8y.png
http://i39.tinypic.com/t5378i.png


.... hard to find some one what sels TOH Cover :(

Re: [WIP] Extended Accu Other Half
 

yep. you cant use 2 different battery cells together (lipo/li-ion/). its killing smaller battery and they do not charge in balans! smaller can burn..

Re: [WIP] Extended Accu Other Half
 

i dont connect two accus, this method will connect to the two pins and charge the internal accu ;)

Re: [WIP] Extended Accu Other Half
 

How are you going to charge the toh battery, with some external charger?

Re: [WIP] Extended Accu Other Half
 

this should be handy!

USB LiIon/LiPoly charger - v1.2

Re: [WIP] Extended Accu Other Half
 

hi! nice work so far!

i wonder how the power management will handle this... usually (i.e. when charging via usb-board) the phone stops charging when the internal battery is full... be sure this also happens when charging via those connectors or you'll end up with some pretty expensive fireworks...

also be sure you don't run into trouble when connecting the phone to a usb-port while this other half is attached (would be double-charging, wouldn't it?)

Re: [WIP] Extended Accu Other Half
 

Charging pins are automaticly disabled when usb cable is connected. And pins have logic that stops charging when its full.

Re: [WIP] Extended Accu Other Half
 

with Popolu Step-up Regulator U3V12F5.

But Very Importend, use one capacitor 100 uF, i destroy before one regulator, i dont know why, but with a capacitor (vin + gnd) works very well.

i builed in a swither between accu and regulator. i want charge the accu with a palm inductions charger and i dont know how it will handle with connectet regulator.

Re: [WIP] Extended Accu Other Half
 

Li-Ion and Li-Poly in parallell are just fine. The important thing is that they are both same voltage when you connect them together, after that they will stay balanced.

Why? Because in lithiun-ion (including lipo) chemistry, the voltage has direct relationship with state of charge, so if you draw 1A from a small battery, its voltage drops faster than the big battery. When the voltage gets even slightly out of balance, the bigger battery with the higher voltage supplies more power. The end result is that both batteries will have become full at the same time when charging, and empty at the same time when.discharging.

Some smartphones and tablets these days use "stacked" batteries, several batteries with different shape and size to fill up as much empty space as possible.

Re: [WIP] Extended Accu Other Half
 

I was thinking about this today and if I'm not totally lost, a simple, mini-usb chargeable external battery TOH could be made for example with these (the phone gets about 8-10 mm thicker from the bottom half):

https://www.sparkfun.com/products/8483
http://www.prodctodc.com/ultra-small...l#.UtVSLLS-FCk

The output usb-port should be replaced with some wire for connecting to the Jolla's 5 V + GND pogo pins. There should be also some protection (voltage cutoff circuit) so that the phone does not draw the LiPo empty. However, I'm not electrical engineer so this is just an idea :)

Edit: this is maybe better: http://www.adafruit.com/products/259#Description but it does not ouput 5 V
Edit2: all-in-one solution https://www.sparkfun.com/products/11231 Maybe I should do this? :)

Re: [WIP] Extended Accu Other Half
 

so basically frankensteining a second jolla battery onto the existing and covering it with a custom other half should be possible, right? surely, this would mean you'd have to switch your phone off to change from single to dual battery setup... on the other hand you'd have the benefit of a still useful battery percentage on the phone...

Re: [WIP] Extended Accu Other Half
 

It is easier to just have few spare batteries for Jolla... :)

Re: [WIP] Extended Accu Other Half
 

This is an extremely bad idea. Connecting batteries in parallel can only be done with exactly the same type and size. Lipo's are extremely vulnerable.

This is simply untrue. No two batteries are exactly the same, especially if your mixing types. It will catch fire. Lipo's require a very specific charger that monitors the battery while it charges. You can't even connect two exactly the same Lipo's and charge them parallel.

Yes, stacked batteries.. And in the case of Lipo's, they are connected individually to a power management chip. My Lipo laptop-battery as a consequence has 10 (instead of 2) wires coming out.

The comparison with Frankenstein is very accurate. (spoiler alert: everybody dies in the end)

Re: [WIP] Extended Accu Other Half
 

or just go for it, glue it on there and see what happens! don't forget to film it! :p

#yolo #freestyle #nobatteriesinjollastore

Re: [WIP] Extended Accu Other Half
 

Ok there is a problem. The regulator operates in the first 30 seconds. Then he gets hot and stops charging. tbr gave me the information that if the regulator gets too hot, ceases to work properly. Something like a protection.

He came up with the idea of ​​maybe two regulators to be connected in parallel. I did that. The output is still at 4.95 V and not doubled.
Now he also loads properly and also does not stop after 30 seconds.

Here is a picture about this:
http://i39.tinypic.com/9atssl.jpg

So eventually solved a problem. Unfortunately, the regulators will still have to this very hot in the pants.

he thing is that the regulator is working optimally at 400/500mA. See diagram:
http://www.exp-tech.de/images/produc...0j4289.600.png

However, the smartphone itself takes on 1000mAh. That's why he overloaded the regulators and are thus hot.

And now I am looking for someone who's good with the kernel :)
Does anybody have idea how to do that? You may adjust so that the 1000mAh over microUSB remains, but limited for the pins at 400/500mAh!?

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

So, receive today the new boards.

3V to 5V DC-DC Converter Step Up Boost Module

i will soldering today, later, and test it if there work better than the pulolo´s Step-Up regulators. Hope it will not so hot like the pulolo boards

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

Hmm, I did not receive those boards yet. But please tell how they perform at 1 A :)

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

did you try the voltage adjustment mod?

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

no, because no time, bu today i start my solderstation, than i will try it too :)
i buy the resistors already

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

So, yesterday I tried out the new board. It works very well, I would say this better than the Pulolo boards. It is also up to slightly hot from little bit hot. But not as hot as in the Pulolo boards.

It charges continuously with 4.85v and 800mA. When the battery arrives at 3.04v, the board stops with the charge. He tried it anyway further boost, but only up to 2.52v, then the discharge protection stopt the charging.

Next step is to integrate a charge protection so that the battery is not more than 3.8 v loaded.

http://i57.tinypic.com/15p1h21.jpg

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

Good work!

There are a lot of chips than can manage charging of lipo's and li-ions.

lipo charger, chip also available separately
http://www.adafruit.com/products/259

even with qi wireless carging option intergrated (just chip):
http://www.ti.com/product/bq51051b

maybe you could even replace your chip with a relais/transistor triggered by the V33 output!

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

sounds interessting, but the board is little bit to big, but adafruit have a micro version:

http://www.ebay.de/itm/Adafruit-Mirc...item27dd61008e

than soldering a micro USB port, too

i will check where i cant find cheap in germany.

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

Exp-tech has it in stock:

http://www.exp-tech.de/Shields/Adafr...harger-v1.html

price is reasonable imho.

btw, very nice project!

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

cool thank you, from there I bought the pulolo boards. Highly recommend the company!

EDIT: Ok i buy two, have to wait 2-3 days for it

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

if you want to design a pcb with a charging and 5v regulator on board, let me know! the chips -almost the only part on those charging/regulator/booster boards- are very cheap!

Re: [WIP] Extended Accu Other Half - - - Kernel Modder needit !!!
 

sounds good, it will be nice to have only one PCB... maybe compact, too :)

i buy now two of adafruit micro usb lipo charger. i will test it :)