Dependingon the battery power and brand, you can use a power bank to charge smartphones, earbuds, laptops, tablets, and many more devices. 10000mAh Fast Charging Power Banks
3 Divide discharged battery capacity by the battery's rule-of-thumb charge efficiency factor (lead acid: 85%; lithium: 99%) to get the amount of energy required to fully charge the battery after factoring in losses during charging. Let's say you're using a lead acid battery. Energy required for full charge = 1200Wh ÷ 85% = 1412Wh. 4.
MiniPower Bank 10000mAh, Charmast 10400 Smallest PD Portable Charger,Mini Power Bank USB C 20W PD & QC 3.0 Quick Charge External Battery Pack, Small Compact Battery Pack Compatible with iPhones,Samsung,Smartphone I have a Samsung S22 Ultra and it gives me 1 full charge in about 1h and 20mins. Second charge gives me around 35%-40%YXJvdk.