Take the 2-minute tour ×  The older iPads have 10W power adapter
(charger), and the iPhones supposed use only 5W chargers.  But
the iPad 4th gen, probably due to the larger power consumption,
uses a 12W power adapter / charger.  Is this charger safe to use
with the older iPads and iPhones. Will it overcharge or overheat
or damage the battery? A more serious worry is that if it
overheats, then can the battery explode?  share|improve this
question add comment  1 Answer  Yes. The wattage ratings are
maximum and all iOS devices will only pull the current they need
to charge.  Should a device or an adapter get too hot to operate
safely, they will shut off.  share|improve this answer add
comment  Your Answer