Can i use a 750mA charger on my iPhone 5 without destroying the battery?

Can i use a 750mA charger on my iPhone 5 without destroying the battery?
my iPhone 5 came with a 1amp 5V charger when i bought it newly, before long the charger got bad and i have to replace. But i have a blackberry charger head that's 750mA 5V, will this charger destroy my iPhone?

No. It will take longer to charge the battery, that's all.

By the way, these things are not "chargers". The charging circuit is inside the phone. They're AC adapters.