Are 2600 mAh portable iphone battery chargers safe to use or will they ruin the battery?

Are 2600 mAh portable iphone battery chargers safe to use or will they ruin the battery? - 2

Go ahead and use it, the battery will get damaged overtime however if you charge it too long or charge it when it is at a high battery percentage such as the 80-90% range. I recommend charging it when it gets low to prevent any damage.

Its safe as long as the voltage and amperage are the same as the charger that came with the phone

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