DrPhone PBM4 20,000mAh Powerbank – External Battery – With 4 built-in cables & 2x LED light & Digital Display - Black

Powerbank: Are you often travelling or on the go and have no access to a power source to charge your phone or tablet? DrPhone® introduces the DrPhone PBM4. The perfect solution to safely and quickly charge tablets, smartphones and all your other devices.

USB port & 20,000mAh: 2.1A gives you a stable charging option and is better for your battery life.
With the 20,000 mAh 3.7V high capacity you can enjoy your device for a long time.

LED light: In addition, the PBM4 has not 1 but 2 LED lights on the side. So you can turn on the light in the evening if you are working on something or need light. Because there are two on the powerbank you have more visibility than 1 LED in the middle.

With 4 Built-in cables Charges 4 devices simultaneously. The portable charger with 4 outputs supports charging 4 devices at the same time, no worries about not being able to charge because you forgot the cable.

Digital Display: The Digital Display shows how much battery is left on the powerbank.

Features:
- 20,000 mAh
- 1 USB input
- LED light
- With 4 Built-in cables Lightning /Type C/Micro USB & USB
- Digital Display

Specification:
-Capacity: 2000mAh
- Input: DC 5V/2.1A
- Output 1: DC 5V/2.1A
- Output 2: DC 5V/2.1A
- With 4 Built-in cables Lightning /Type C/Micro USB & USB
- Material: ABS
- Size: 130x70x20mm
- Torch: Yes 2 pieces
- Wattage: 10W
- Weight: 225G
- Included cable: Micro USB

Explanation about mAh:
Difference between battery capacity and actual capacity
One third of the capacity is lost. The technical explanation is complicated, but the rule is simple: the actual capacity of a powerbank is about two thirds of the stated capacity. The rest disappears during the conversion of the power or is lost during charging, especially as heat. Powerbanks with a battery of 10,000 mAh or 20,000 or 30,000 mAh actually only have 6,660 mAh or 13,330 mAh or 17,500 mAh capacity.

That powerbanks have two thirds of the stated capacity is largely because the power must be converted. The voltage of the powerbank battery is for example 3.7 ampere, but to charge a smartphone or tablet the powerbank must increase the voltage to 5 ampere. By increasing that voltage, only 7,400 mAh remains from 10,000 mAh, a quarter less. This applies to every powerbank, regardless of capacity or quality. During charging, about 10 percent of the remaining energy is lost. That 7,400 mAh is then only 7,400 x 0.9 = 6,660 mAh. Much of that energy is lost as heat: that is why your smartphone often gets warm during charging.