Battery Issue

[bigboi146]

So I went for a drive today and decided to drive to the park which is about 5 city blocks away so by the time I get there the truck hits the lvc (which is set on auto-lipo @ 3.2)(5s 4900mah 20C). I could have sworn I had more battery left from a previous run. So I walk back home and plug in my blinky balancer and I notice that all of the lights aren't turning on(indicating low voltage. I don't have a volt-o-meter( i know I'm stupid) so I plug up my pack and it's reading 17.6 volts. I've been trying to charge the pack slowly but my charger(EOS 5I) keeps ringing saying low voltage check the battery. I'm sort of bewildered at his point... I'm not sure if a cell went dead or not but I'm wondering if I should keep up putting MAH into the pack until it reaches 18.5v or should I dispose of it and buy another pack.