I purchased this product Nov 1, 2018 through Amazon. I fully charged it as indicated by all indicator lights lit and put it in my vehicle for emergency purposes. The instructions suggest to recharge it every 3 months or so. Since I am about to go on a trip I pulled it out to do so, and found it was completely discharged. I plugged it in to the house current as instructed and the first light started flashing. In 4 hours the second light started flashing so I left it plugged in overnight. This morning the two first lights were on steady. I unplugged it and lightly tapped the power button and the first two indicator lights and the forth one came on momentarily and the went out. The third indicator light did not come on at all. At this point I am unsure if I have a fully charged unit or not, or do I just have a third indicator light that is not working. What do you think?