How to build a DIY PowerBank with 6x 18650 Li-Ion cells using a kit. Ebay sellers call this Power Bank kit "DIY" because it comes with no batteries :). You have to put your own 18650 Li-Ion cells in it. For just $2.70 including shipping still not bad.

WARNING: Li-Ion batteries and power banks can catch fire or explode! Risk of fire, injury and burns. You do everything at your own risk and responsibility.

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