Blackwidow v4 LP TKL won't charge

Hi, 

My keyboard is almost new, i own it about 3 months. Today my battery dropped to 10% so i decided to charge it. However, at first it didn’t charge at all, then synapse showed me 100% battery level while connected by wire, then i unpluged it and the level dropped to 10% again. I already tried updating firmware, re-installing synapse, checked the wires, dongles and etc. Nothing helped.