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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