In this section, you will be able to check the results obtained in the charge/discharge tests for each power bank tested on our website.
In order to properly compare among several models:
- Select the type of discharge: Standard (default), Quick Charge or Power Delivery.
- Choose the capacity.
- As an option, you can filter by brands: Xiaomi, Anker, Aukey…
Also, if you have any questions about our tests or want to propose a power bank for testing, you can do so in the comments section.
Next, we will explain how our technical team performs the recharge/discharge test for a power bank:
In order to obtain optimal results during the measurement tests, 3 full charge/discharge cycles for the power bank will be carried out beforehand.
The efficiency in recharging the power bank is measured by including the manufacturer’s charging cable and using a suitable charger for an efficient recharge.
The discharge efficiency of the power bank is measured at its output port, without including any cable or connected device.
In addition, this efficiency will depend on the voltage and current set in the electronic charge, that is:
A power bank will be less efficient the more current it is required, because it will lose energy in the form of heat (Joule effect).
The discharge of a power bank to 5V/1A must be more efficient than its discharge to 5V/2A.
Also, a higher discharge voltage will affect its efficiency due to the voltage conversion that the internal power bank circuit must perform.
The discharge of a 5V/2A power bank should be more efficient than its discharge to 9V/2A.
Logically, in our analysis we establish the same values of voltage and current in the electronic charge in order to compare results between the different models tested.
Using a USB charger, a full recharge of the power bank is performed for each type of recharge available: Standard and Fast Charge (QC/PD), and the following data will be recorded:
- Average Voltage (V): average voltage during the recharging process.
- Average Current (A): average current during the recharging process.
- Input Energy (Wh): energy supplied to the power bank by the charger.
- Recharging Efficiency (%): power bank recharge efficiency or, in other words: relation between the energy stored in the power bank battery and the energy supplied by the charger.
- Recharging Time (h): time the power bank has taken to recharge.
- Charger: charger used.
By means of an electronic charge, a complete power bank discharge is made for each of the available types of discharge: Standard and Fast Charge (QC/PD). Likewise, the following data will be recorded:
- Average Voltage (V): average voltage during the discharge process.
- Average Current (A): average current during the discharge process.
- Actual Output Capacity (mAh): actual capacity available at the power bank output port.
- Output Energy (Wh): energy supplied by the power bank.
- Conversion Rate (%): efficiency in the power bank discharge, that is: ratio between the total energy the power bank can supply to a device and the energy stored in its battery.