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Originally Posted by autofils";p="
Latest from DiscountTown: No longer has 420mAh battery. It is 250/280mAh !!
I had considered putting the 280mAh battery in parallel with the existing 200 mAh battery in my SY-158 player, but decided that outside mounting was not such a great idea.
Instead I made a 4 cell AA pack of Ni_Mh AA batteries (2400mAh capacity) and connected it to the USB port.
MP3 duration with this battery-extender gave a duration of about 24 hrs continous mp3 playing with screen blank of 12secs. Works great !!
Could use AAA cells to make the battery pack a bit smaller, and I would guess that you would get 12-15 hrs with 1000mAh AAA cells.
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Autofils you are on the right track with the external charger concept. However, I'm a little concerned you are pumping 6V into the mp3 instead of 5V.
There is a quick way to do this, and it's really, really cheap.
Get a battery case that holds 4 AA or 4 AAA, your choice. It will have the positive and negative leads popping out of it. Now go to your neighborhood electronics store and look for a LM7805 Power Regulator or equivilent. They are the size of two pennies stacked on top of each other. I don't have the diagrams right now, but basically you attach the positive lead of the battery pack to the input pin of the regulator. Connect the ground line of the battery pack to the ground on the regulator. Then you take a USB female end (cause this pack will be able to charge anything that charges via USB) and attach the ground to the ground pin on the regulator and the positive pin to the output pin of the regulator.
I'll build one this afternoon to show you how simple it is.