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Are battery banks safe?

Are these battery banks with various inputs actually safe? Anker is a popular make on Amazon.

We have a handful of different phones and tablets in our apartment, but surely they have different needs in terms of current or whatever?

Most Useful Answer TheGalaxy  Feb. 18, 2014 at 14:27

Put very simply, phones only really take the amount of current they can cope with. So for example using a 2A charger instead of a 1A charger will only really result in potentially charging the phone faster if it can draw more than 1A of current, else it'll function the same as a 1A charger.

IIt's completely safe, if you want to break out a little physics then as I (current) = V (voltage) divided by R (resistance)
Assumming all devices use 5V which should be standard, then we can eliminate V as the cause for changing current - as it's constant, so what's affecting the current must be R. The resistance is what the phone places on the charger and as such this is what determines the current draw of the phone - the charger doesn't constantly push out it's full 2A etc. but only the amount determined by V/R from the phone.

As a summary: what does matter is the voltage - probably 5V - this can damage the device if incorrect. The current however, as long as the chargers current is greater than the device then that is not a problem.

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neelsn007  Feb. 18, 2014 at 14:26

The newer Anker models can auto detect current and voltage to adjust accordingly

TheGalaxy  Feb. 18, 2014 at 14:27

Put very simply, phones only really take the amount of current they can cope with. So for example using a 2A charger instead of a 1A charger will only really result in potentially charging the phone faster if it can draw more than 1A of current, else it'll function the same as a 1A charger.

IIt's completely safe, if you want to break out a little physics then as I (current) = V (voltage) divided by R (resistance)
Assumming all devices use 5V which should be standard, then we can eliminate V as the cause for changing current - as it's constant, so what's affecting the current must be R. The resistance is what the phone places on the charger and as such this is what determines the current draw of the phone - the charger doesn't constantly push out it's full 2A etc. but only the amount determined by V/R from the phone.

As a summary: what does matter is the voltage - probably 5V - this can damage the device if incorrect. The current however, as long as the chargers current is greater than the device then that is not a problem.

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