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[HowTo] Replace x10 mini battery

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By Gx3, Senior Member on 22nd October 2011, 12:39 PM
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The battery used for test is a BST-38 li-ion and should be 1200mah 2€ so I don't expect to be a great battery but this is only for reference.

tear down instructions

Please read all before starting this will help you choose the most convenient acting way.

Removal of original battery from its placing is a pain in the ass, cause it is very well attached to the aluminium cover whith a very sticky double-face tape ...so proceed with caution, after that I preferred to remove that tape: this permits to connect the battery "the rough way (img 10)" and then place the cover whithout sticking.

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This battery was easy to disassemble by removing printed tape and making a small cut on the bottom
...but be aware this may be not so easy with others!!

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soldered wires, this is a very complicated step for those who do not know how to use a solder very well, short circuit is round the corner, so first solder positive wire, then cover it with a good thermal tape then proceed with green (again cover it) and finally go for black. (however remember to solder wires in a sequence that avoids overlapping of wires while soldering: if the sequence was black>green>red it would have been easy to melt black wire while soldering green wire... and melt both green and black wire's cover while soldering red)
Note that wires are soldered to run on the opposite direction in comparison wiht the original battery wiring, the reason is to obtain a perfect fit into battery compartment and to obtain a better resistance to wire dragging.

9
Paper tape has been used to insulate battery's body.
Please note that this picture does not show the final battery placing, you should imagine the batteryrotated by 180° (with wires on the right of the current image and then running on the side of the battery up to the hole which exposes the connector).
So make sure the wires are long enough if you are wishing to use this setup
(otherwise simply solder wires to run the opposite way compared to img 8).

(warning: the whole body is the Negative pole of the battery)

10

Wires need to be cut perfectly to make sure they don't move,
green wire should be a little bit shorter than red and black shorter than green.
Wire's edges are stained, flattened with plain edge pliers to fit into connector (a hammer and a flat surface will do the job too) and cut to result fully inserted (this avoids unwanted wire scattering while plugging into connector). All this paying much attention to not short circuit wires (I suggest to ready wires one by one insulating with tape each edge, when done proceed by deinsulating and plugging one by one).

warning : positive (red wire) and middle battery contact (green wire) are both positive so prevent any hazard, notice that the whole battery's body is NEGATIVE so handle all wires paying much attention!!

yeah I know i did'nt use the original connector but this is not meant to be a permanent solution
and still have the original battery usable

Before closing the hole with its rubber cover I placed some folded paper on the wires shown in image 10 (just to make sure the cables don't move).

Thanks
to TheCuteCriminal for making public that Bst-38 batteries can be modded to fit
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22nd October 2011, 02:52 PM |#2  
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Thumbs up Good work !!!
Good tutorial & good Job Gx3.......
This will be helpful for many people....
And thanks for mentioning my name.....

ps: now im modding our data-cable. Hope after modding,the USB-OTG feauture will be available on our mini's.
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22nd October 2011, 04:40 PM |#3  
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for who's interested this battery seems not so bad,
yesterday I had poor performance while calibrating but today is behaving much better, however I will give you more accurate details after few more power cycles cause the battery seems to have been stocked for a long time (traces of rust inside inner contacts )
23rd October 2011, 05:35 AM |#4  
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this thread is now linked in the 3rd post of my FAQ
thk you both
26th October 2011, 04:30 PM |#5  
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regarding the 1200mah 3gpower battery:
now seems to have reached its ful capacity (in 5 cycles)
when I made the substitution the original battery used to last 8-9h with 3g data on and without sync (running miniCM 2.3.1), til now it endured about 800-900 charging cycles

It is well known that minicm (cyanogenmod) has a high battery drain under 3g with data on and
this battery lasts 12h with data on and sync enabled (more power drain), + 20 call minutes.
now I completed the definitive calibration, and will test in normal conditions

I can tell it behaves a little better than original when was new and it seems that dischargnig is more linear

takes about 100 min for charge vs first charge's 60 minutes

It took a while to obtain an almost full battery waking, but now it is all ok

more details in the next few days
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27th October 2011, 07:37 AM |#6  
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Seems complicated, thank god I got a mini pro.
19th November 2011, 04:25 PM |#7  
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so how is the battery performing in everyday life? better than stock or similar to it?
10th December 2011, 07:27 PM |#8  
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Good tutorial ! Thanks!
31st December 2011, 11:56 AM |#9  
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I've just ordered the gold bst 38 2430mah battery... this is meant to be a more serious attempt with a much nicer battery... and eager to unveil results
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3rd January 2012, 06:56 AM |#10  
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assembly
well it looks ok to tear it down, but how do we assemble it again?

i tried once to change the front cover but couldnt dare to pull the connection of the screen. coz i dont dont how to connect them again
3rd January 2012, 01:05 PM |#11  
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Quote:
Originally Posted by Odysseus348

well it looks ok to tear it down, but how do we assemble it again?

i tried once to change the front cover but couldnt dare to pull the connection of the screen. coz i dont dont how to connect them again

all of them are pressure autolocking type connectors or lever locking flat cables, the only hassle may be operating in a narrow environment... but a pair of cheap precision pliers can do the job
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