Let the sun lend you power when you need power and battery is dead~Praise the sun！Here share my latest project, a Solar USB Charger Backpack~ We Need Hardware： 3W Solar Panel 138X160 Lipo Rider V1.3 Lipo battery 38*42*3.7 mm, JST 2.0 Interface, 3.7 V, 550 mAh Micro USB CableStructure： 3D printe...By: Seeed Studio
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