2x 21700 4x 21700 Battery DIY USB Power Bank Box With Type C USB Input Charging Battery Charger Box for Smartphone Tablet PC - AliExpress
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18650/21700 power bank / charger suitable for very low loads : r/batteries
Ledlenser FLEX5 Power Bank & Charger with 4500 mAh 21700 Lithium-ion B – Torch Direct Limited
130W Two way 65W PD100W 20000mah Power Bank 21700 Battery Multiple protection LED Display Charge Laptop Phone Alloy Emergency - AliExpress
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Baltrade.eu - B2B shop - Charger/Power Bank for cylindrical batteries Li-ion 18650/20700/21700/26650 Xtar PB2S Yellow