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Put it in Airplane mode and turn down the brightness while charging. See if it will charge to 100%. If not then take it back to the store and have them run a test.
 
iPhone 5s charges only upto 98%

How old is the phone? I'm pretty sure your battery is fine, the reading may just be off. Do you usually do a full cycle charge (0-1% to 100%)? Try that for a few days to see if the reading is calibrated.
 
If you were to turn the phone off and on I bet you it will say 100% on reboot. Happened to me as well. The battery percentage is just an estimation.
 
oh snap I just remembered that happened to me too. I let it charge in the wall overnight. When I went to disconnect it said 98%. So I turned it off/on and it said 100%. That was earlier this month. So far so good…I haven't seen it do that in awhile.
 
How old is the phone? I'm pretty sure your battery is fine, the reading may just be off. Do you usually do a full cycle charge (0-1% to 100%)? Try that for a few days to see if the reading is calibrated.

This worked. Thanks all for your help.
 
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