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kayleee

macrumors regular
Original poster
Nov 20, 2013
133
6
I got a sony power bank which says its 10,000 mah

however, on the back it says its 10,000 mah and states that it is output of 6,000 mah , which I was not aware before buying

As i understand what output means....does it mean it will charge a 3,000MAH phone battery just twice, since it is 6,000 mah output

Or, will it charge it 3 times, since it is actually 10,000mah (but I'm still confused about the 6,000 mah output)



Help me pls did I waste money :I
 
Can you link to the item you bought, or take a picture where it says that? Usually output is referring to the ability for the charger to output to devices, but it's usually measures in amps and not amp-hours. For instance it may look like "Output: 5V @ 4.8A (2.4A per port)"
 
mah is more accurate for a battery. It tells you how long it can supply the current unlike a charger on continuous power.

If you believe the numbers it looks like it will charge the phone battery twice.
 
Could it be that it holds 10,000 but 4000 is lost in the transfer. That does sound like a lot. Usually in my exp its about 20-25% lost in the transfer. So a 10,000 mah bank would have about 7500 available to charge a device
 
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For it to have the same output it would need to be 100% efficient. That is not going to happen. I am betting you will only get about 2 full charges with the 2nd charge getting very slow to the end.
 
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mah is more accurate for a battery. It tells you how long it can supply the current unlike a charger on continuous power.
mAh determines the capacity, not the output.

For it to have the same output it would need to be 100% efficient. That is not going to happen. I am betting you will only get about 2 full charges with the 2nd charge getting very slow to the end.
That's true, but you don't see capacities written on the battery what the rate is after adding in the efficiency loss.
 
I have a 12,000 Anker battery pack and I get about 8500-9000 out of it after transfer loss. So about a 25% transfer loss. 40% seems like a lot for the OP, but it's not entirely out of the realm of possibility. Could just be an inefficient power bank.
 
I got a sony power bank which says its 10,000 mah

however, on the back it says its 10,000 mah and states that it is output of 6,000 mah , which I was not aware before buying

As i understand what output means....does it mean it will charge a 3,000MAH phone battery just twice, since it is 6,000 mah output

Or, will it charge it 3 times, since it is actually 10,000mah (but I'm still confused about the 6,000 mah output)

Help me pls did I waste money :I
That sounds about right. You will typically lose about 40% in heat when using an external battery to charge anything. It's simple physics. Your product is not flawed.
 
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