Often in the little leaflets that come with chargeable electronic gadgets, Manufacturers state that you should only use the original supplied charger to charge the gadget.

We all know that an iPhone does get charged with an iPad's charger, but does this have any bad side effects? For example, would it lower the life expectancy of the battery on the iPhone?

What I have is a iPhone 5S and often charge it with iPad Air's charger.

Thanks

Often in the little leaflets that come with chargeable electronic gadgets, manufacturers state that you should only use the original supplied charger to charge the gadget.

We all know that an iPhone does get charged with an iPad's charger, but does this have any bad side effects? For example, would it lower the life expectancy of the battery on the iPhone?