Battery Tests, Homemade 3000mAh XL Battery & Q&A (POST #1) - New Layout - Page 69 - maemo.org

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	dr_frost_dk	2011-05-25 , 20:08
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#681

If one battery says 50 and the other 75, then the connection is not good enough, there should MAX be a 5% difference when disconnected from each other.

This is why i made mine in the "destructive" way, i don't want a sudden shutdown because connection is "bad"

All the battery's i have (Not N900) are also soldered good together because of this, my Electro ciao pulls 110A so this would be bad and would destroy parts of the battery if only some of the 36 cells would suddenly pull the hole load

Other mod i would recommend is zimon's mod

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Frappacino	2011-05-26 , 05:27
Posts: 619 \| Thanked: 691 times \| Joined on Feb 2010	#682

FYI I just used copper wire that was sold as picture wire

you know, the copper wire that is used to hang pictures up sold at bunnings. Not sure if thats substantially diff from electrical wire - but it does say pure copper.

I charge over 95% no issues on usb and I often charge on external desktrop charger (when I pop battery into phone its over 90% using the QBW script here), although my double battery probably does not get as good capacity as the destructive mod though. Still decent

if ppl want pics I can post some - but it just looks kinda like the earlier pics before.

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	dr_frost_dk	2011-05-26 , 08:02
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#683

For fun i did a charge last night with a USB charger (500mA) not fast charge
Heres the results for USB vs. my external/internal charger

NOTE: doing my charge recaller had craped out and was as you can see totally ripping the power/cpu
Also note that my charger gives a few more % of charge

My external/internal charger:
Name: EX charge.png
Views: 406
Size: 7.4 KB

Name: EX charge.png
Views: 406
Size: 7.4 KB

USB charger:
Name: USB charge.png
Views: 430
Size: 10.1 KB

USB Charger: http://www.dealextreme.com/p/designe...100-240v-59503

Fix you USB before and after it breaks
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	anapospastos	2011-05-26 , 08:39
	Posts: 553 \| Thanked: 183 times \| Joined on Oct 2009 @ Not decided	#684

FYI I m using this external battery charger that can fully charge the scuds. Its output is very low, ~250-300mah, but for 5$ it is good. It takes it almost 5 hours for a full charge cycle. Also, you can use its usb output for other charges, ~800mah (didn't tested if this is the actual value).

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	dr_frost_dk	2011-05-26 , 08:55
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#685

Originally Posted by anapospastos

FYI I m using this external battery charger that can fully charge the scuds. Its output is very low, ~250-300mah, but for 5$ it is good. It takes it almost 5 hours for a full charge cycle. Also, you can use its usb output for other charges, ~800mah (didn't tested if this is the actual value).

Thats a nice little very cheap charger, but not fast, if you where to charge a dual scud, you would be looking at about 10 hours.

Remember im using the 3000mAh setup, the charger i normally use to charge with is http://www.dealextreme.com/p/mystery...-charger-35704 it really sucks at charging multi cells but charging single (3.7V) battery it works fine, this is the cheapest RC charger i have and it is just generally use to charge all my single cell "gadgets" like DIY led torches.

Fix you USB before and after it breaks
Feel free to contact me through PM, Skype or G.Talk

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pfontana77	2011-05-26 , 09:07
Posts: 55 \| Thanked: 13 times \| Joined on Jul 2010 @ Italy	#686

Originally Posted by dr_frost_dk

If one battery says 50 and the other 75, then the connection is not good enough, there should MAX be a 5% difference when disconnected from each other.

I also was expecting not too much difference in charging level, 25% is too much, the phone was using only one battery since the duration is not so good compared to the other users test.

Originally Posted by dr_frost_dk

This is why i made mine in the "destructive" way, i don't want a sudden shutdown because connection is "bad"

Without soldering experience is very probabily that i can only do damage to the battery, and don't want to wait another month for another shipment, plus the increased cost.

Anyway i remade the plug with soldering wire this time, it is much more malleable and less prone to lose the contact, at least for me. Now i think that is working, for two reason: the first one is that your QBW indicator is more stable, in the previous attempt the value fluctuate very much, now is reasonable. The second is the duration, i lose only a 25% in 13 hrs, with 3g always on, IM always on, 2 hrs of web navigation. This is a sensible increase in life, in the previous attempent with the same configuration the battery was almost drained.

So let's see in the next days how it behave.

Originally Posted by anapospastos

FYI I m using this external battery charger that can fully charge the scuds. Its output is very low, ~250-300mah, but for 5$ it is good. It takes it almost 5 hours for a full charge cycle. Also, you can use its usb output for other charges, ~800mah (didn't tested if this is the actual value).

Are your scud totally discharged. Because 5 hrs * 300 mAh = 1500 mAh, the value of a single Scud. You should recharge 3000 mAh for having both the scud fully charged, so it is necessary 10 hrs with this charger.

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	dr_frost_dk	2011-05-26 , 09:24
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#687

Are your scud totally discharged. Because 5 hrs * 300 mAh = 1500 mAh, the value of a single Scud. You should recharge 3000 mAh for having both the scud fully charged, so it is necessary 10 hrs with this charger.

Just a little correction here, the first 60-80% charge will be at 300mAh, then it will go down in charge rate because the voltage potential gets smaller between charger and battery, this causes the last bit of charging to take "forever", the last 10-30% might only charge with 20-100mA

Fix you USB before and after it breaks
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	dr_frost_dk	2011-05-27 , 11:41
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#688

It seams that mugen is on to me/us

Now they are not selling the XL cover unless you have bought the battery from them, i cannot confirm this (don't have the money to buy...) and was brought up by another user.

Can anybody else confirm this?

NOTE: im finishing up the first video, it so far is only going to be a dissemble video, this is the most important step of them all, if this step is not done properly then it will be almost impossible to make the dual battery, the way i did

Fix you USB before and after it breaks
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	Estel	2011-05-27 , 13:58
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#689

Originally Posted by dr_frost_dk

It seams that mugen is on to me/us

Now they are not selling the XL cover unless you have bought the battery from them, i cannot confirm this (don't have the money to buy...) and was brought up by another user.

Can anybody else confirm this?

False, at least for me. As i said before, i ordered mine on 09.05.11 and considering their info true, it's already shipped to me, after little delay problems - I posted about it here few posts before.

But, it is still possible that I angered them so much that their started to check

Anyway, if they really started to, they don't keep tracks from the beginning of N900 mugen battery availability. I think that checking when they started selling it and telling that You bought it on same month, and of course can't prove it after all this time, may help.