maemo.org - Talk - View Single Post - n810 extended battery

	Karel Jansens	2008-11-12 , 19:05
	Posts: 3,220 \| Thanked: 326 times \| Joined on Oct 2005 @ "Almost there!" (Monte Christo, Count of)	#63

Originally Posted by bunanson

OK, I can take it from the middle to avoid a step down step, that sounds good. Now, is there any ready made USB circuit board to give me the output? Or, I would have to gut out some of the USB extender battery? Maybe this is something within reach .......... I will see whether I can gut out a USB circuit board from my collections. I think an 8 cell AAs will last longer than a 4 cell AAs, that is why I am interested. Of course, if I can buy one that would be better :-)

bun

There are lots of DIY battery extenders at Instructables. I'm pretty sure several of them have handy diagrams. Basically, if you follow Benson's lead, all you need is a diode to prevent current flowing back from your tablet to the batteries. Or you could go to your local electronics store/Radio Shack and ask the friedly attendant what kind of diode you need (it depends on voltage and power throughput). and how you should solder it up (putting in a diode backwards kinda negates its purpose).

The 8 AA version will not only last longer, it might have actually enough oomph to fully charge a tablet's batteries: If you're using 2500 mAh rechargeables, you're providing a max of 5 amps to the charging plug, which it'll like.

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