DP 7724 solar power bank

It has solar-panel charging capability: a built-in solar panel lets it charge (or at least top-up) using sunlight.

Specifications

• If you consider buying a DP-7724, you should demand that the seller specify clearly:

  
  

  • Battery capacity (in mAh and voltage)

  • Type of battery (Li-ion / Li-polymer)

  • Input specs (solar panel output — voltage/wattage & USB/AC input)

  • Output specs (USB-A, USB-C, DC — voltage/current)

  • Realistic expected charging cycles (how many phone charges, about how long solar charging takes)

  • Whether there’s a charge / discharge / over-current protection circuit