Iphone 7 plus charging cable & adapters issue?

Look my charger can charge my phone no question but when a family member use it for the iphone 7 plus it charges slowly like snail likes slow or does not charge at all.

its like vice versa when i use the charging cable any ideas why it does this is the cable faulty or the phones?

It may be the amps are different. Tho depending on what phone you have and they have the chargers works differently. If you don't have a iphone and they use your charger for their phone then it will be slow and if you use a iphone charger it will do the same. Its all to do with chargers

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