i bought a 8 pack of these with the smart charger that charges 8 at a time,after about 6 hours they started getting getting a full charge but 2 of them never would go to full charge even after an extra 3 hours?
Did you discharge them all the way down? Sometimes a battery will stop taking a charge after a certain level. I had it happen once on a brand new battery and I ran the discharge all the way down then recharged it and it went full. That took almost 16 hours to fully discharge and fully recharge it.