Extended battery to charge with 5v charger/

[Android20120]

I have bought Anker 4400mah extended battery to use with I9300 but am nervous about using as the battery has a warning - do not charge with voltage higher than 4.35v - but the S3 charger is 5v. Is it safe to charge with this? If not, do I need another phone charger at a lower voltage? Any recommendations? Or do other extended batteries allow 5v charger to be used?

Thanks