Same thing has happened to mine after only 5x charges. I have posted a topic as well. One or more cells in one of the parallel batched failed causing a whole batch to read 0V. I first contacted Enertion for help in Feb and followed up every few weeks with no response. I then opened a returns request 3 weeks ago and it has just been left sitting as ‘pending’.
I’ve messaged them multiple times and the response is always ‘we will get a technician to contact you’. Never happens of course… I will be interested to see if they get back to you or just leave everyone with faulty items hanging.