jneong

Absolutely. Any of the cells near the 18650 size should work. I always recommend/caution people recycling those cells that you check they are in good charge cycle condition and have over/undercharge protection circuitry. Last thing you want is a Speakerbox that explodes while charging next to your flaming Hoverboard ashes.

Thank you, I am glad I could share some knowledge and experience! I added the 3A 12V->5V USB converter to provide a charger to phones or tablets on the back of the stereo. With the 6Ah 12V Li-ion battery built-in, I usually get a 24 hour battery life, so there is plenty of juice to spare :)