If you've left Intellect 4200 cells lying around for a year they are dead.
You most likely have a bunch of 0 Volt cells in the pack which are not taking charge and the other half are taking a hammering. Measure each cell with a voltmeter and check voltages.
To be honest I'd toss them in the bin rather than risk charging cells which might explode on charge or during discharge or even just in storage.
Pick yourself up a decent lipo and charger and enjoy
