So i finally bought it.
It's very noisy when powered on the first time, then when the batteries are fully charged the fans lower their speed a little, but they are still too noisy for me.
Way too noisy, and i won't be able to let it run this way (it's sitting near my desktop with my computers, built only with quiet parts).
I saw the fans inside were common 12V 80*25mm, so i'm wondering if there is a way to replace them for quieter ones without harming the UPS ?
I don't know the cooling needs of this UPS, but as i already have a 100% fanless APC SMT750I line interactive i think it could be possible.
Also the output air is still pretty cold.
On the other hand i really don't want to destroy anything by modding the inside or by making it overheat in case of insufficient cooling/higher load...
What can i do ?