Smart Choices for the USB Batteries Now

Having a portable usb battery has become almost indispensable. Every day we frequently use the smartphone in different situations: web browsing, site consultation, car navigator, mp3 player and streaming audio, to watch videos, social media, take photos and shoot videos and it is always difficult to get to the end of the day.

If the path is particularly long, it is important to have an additional battery. Especially if we are following a GPS track, having the phone discharged could be a problem (for this reason, besides the power bank, we recommend having a physical map and taking notes on a sheet of paper, or printing information. because the phone may still stop to function for any reason). In addition, for emergency it is always important to have the phone charged for any calls. Now from The Tech DJ you can get the best deals.

Guide to the characteristics of a power bank


It is expressed in mAh, similar to the battery of your smartphone. For technical reasons, often, to relate the battery of the power bank to that of your smartphone in a truthful way, you have to take away about 25% of the capacity value of the power bank. Example: if your smartphone has a 3,000 mAh battery, and the 9,000 mAh power bank you will not be able to fully charge the phone 3 times, but let’s say about 2 and a half times. This depends on the volt of the power bank: the betteries of the phones work at 5 V, the power banks usually 3.7 V.

Output power

The classic output power is 1A. The new smartphones begin to accept higher powers for charging, such as 2.1A or 2.4A. If your power bank supports these output powers, and your phone accepts them, charging will be faster. Same thing for Qualcomm’s QuickCharge, if power bank and phone support it, charging will be especially fast.

Weight and size

The capacity of a battery is directly related to the size and therefore the weight of the power bank. A very large one will obviously be bigger and heavier. This characteristic must also be assessed during the purchase phase.


The classic power banks had a USB A output (therefore where to connect the cable to recharge the smartphone) and a microUSB input (where to connect the cable to recharge the power bank itself, towards a normal battery charger for wall smartphone) . With the advent of USB C, more and more power banks are starting to use this type of port. Given that there are adapter cables from one type to another, USB C is preferred because in the future it will be the standard for all devices, because it is more comfortable and performing. There are also power banks with Lightning cable, the Apple standard, you know you own an iPhone you will know what we mean.

  • capacity: 5,000 mAh
  • power:1 A output, able to automatically adapt to the power accepted by the connected device
  • dimensions: small and light (about 10 cm high by 3 wide, less than 120 g)
  • 4 leds to check the residual charge
  • excellent value for money, excellent reviews and technological safety equipment