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Adding lithium battery to portable speaker : r/ElectronicsRepair
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![Cigar Box Guitar Amplifier Kit - 9 Volt Battery Powered Amp with a 3" Speaker | eBay](https://i.ebayimg.com/images/g/OtIAAOSwfttd1geO/s-l1600.png "Cigar Box Guitar Amplifier Kit - 9 Volt Battery Powered Amp with a 3" Speaker | eBay")
Cigar Box Guitar Amplifier Kit - 9 Volt Battery Powered Amp with a 3" Speaker | eBay
