NiMH charger
 

I bought a new NiMH battery because my old one is not keeping his charge. I'm not sure but i think that's because my charger charge it too fast or too long or anything like that.

I would like to know if my charger is fine for an NiMH 8.4V 1500mAH? or if i need a new one for keep my battery safe?

Charger specification: Model: NH15050(F05)
Input: 100-250V 47-63Hz
Output: 5-15V|500mA
Battery QTY: 5-10

Thank you! I just don't want to break my new battery =)

Yes that's fine, but you should really buy a smart charger with peak detection and shutoff, not a dumb wall charger.