Good guide. I did not want to spend $14.00 for a battery. I took apart an old hp laptop battery which has 6 cells in it. Checked and they were not completely dead. Removed 2 cells ( I have 2 of these iPod docks). Soldered the small control board/ harness to the “new” cells. Works. Getting a little over 4hrs played at second loudest volume. Good enough. Have 2 working units for zero cost. Just ordered a Bluetooth iPod adapter ($4.60) so I can be full wireless. Really good sound too.
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