CONNECT IT CI-245 - Manual (Page 3)

Important Information about Power Banks
Capacity
Energy transfer from one accumulator to another cannot take place on a lossless basis. If
your phone has a battery with a capacity of 2500 mAh, this, unfortunately, does not mean
that a 5000 mAh power bank will charge the phone two times. The calculation is subject
to a number of factors.
Power bank batteries have an internal voltage of 3.7 V, while a standard USB output has
5V. In such a transfer, there is a loss of approximately 10 – 20%. The battery inside the
phone usually works with voltage ranging from 3.7 – 3.8 V. In this case, then, a conversion
takes place from 5 V to 3.7/3.8 V. After discounting the loss from the voltage transfer, the
device being charged can make use of approximately 65% of the energy stored in the
power bank.
For the reasons above, when selecting a power bank, the loss resulting from charging
must be taken into account and a power bank with a high battery capacity should be
chosen.
How to Make Best Use of a Power Bank?
„ To make maximum use of the energy stored, charge your device before it runs out of
power.
„ Use a power bank whose output current is at least 2 A.
„ Do not subject the power bank to direct sun and high temperatures. The ideal tempe-
rature ranges from 0 up to 25° C.
„ Charging can be negatively impacted by using a poor quality cable.
„ Before long-term storage, charge the power bank to approximately 50%; you will
extend its life.
„ Store it in a dark, dry location with a temperature ranging from 0 to 20° C.
„ If the device being charged is turned on during the charging process, energy is con-
currently consumed. That is why all energy demanding functions (Wi-Fi, video, games,
etc.) should be turned off for speedy charging.