what ill do, first i charge mo batts mo to full. then load test it, pag bagsak sa load test, sira ang batts. but according to you, di nag charge yung unit, then may possiblility charger and sira. just make sure you connect all connection the proper way. baka di tight ang pag connect. (this usually happened) but if ok yung connection, di nag charge, possibly charger mo na. good luck!