The charging amperage is controlled by the cable quality, so as long as you are using the charging cable that is provided with the Airplus earpods or a certified lighting cable the current is regulated.
The Battery Life specs:
For earphone:
1. standby time : about 80 hours
2. music play time: about 80 mins ( Max volume)
3. talk time: about 2.0 hours
4. charging time: 60 mins
For charging case:
1. charging time: about 120 mins
2. when charging full, can be charged 3-5 times.