Well, I changed the battery for 9Ah (on the other hand I am making the claim to see if the warranty covers me since it is only one year old). What I notice is that, according to the monitoring software, the voltage remains at 13V since I installed it, but the percentage of load has been falling (it went from 100% to 73% currently installed but the voltage remains fixed at 13.0V , the backup time varies very little in the order of 8 minutes). Is it being calibrated or is there a problem?
Sorry for the delay (I didn't get any notification !!!). It has already stabilized and it indicates an autonomy of about 12 minutes and remains at 13.8V. Thank you!!!