Excessive voltage drain?, charging problem?

[chrisg3]

Hey Freaks,
I recently purchased the Duralite Plus voltage regulator (w/ heavy duty switch). Currently, I've charge it about a dozen times. Yesterday, before my first flight I checked the voltage and it wasn't at it's normal 8.2 volts (7.7 w/ 1 amp load) it was a bit lower 8.0 volts (7.4 w/ load). This was strange because I had charged it the evening before and normally read higher voltages the next day. Nonetheless, I flew and checked it each flight and everything seemed fine.
I charged the pack again, however after six hours the pack was still charging. I took it off charge and checked the voltage and it read 8.28 volts (7.75 under load). I waited 8 hours and rechecked the pack and it reads 8.08 volts (7.6 w/ load). This seems like an excessive voltage drain for sitting unused by itself. (please note that I have the switch wired correctly)
Now, I have the pack back on charge (remember it was already at 8.08 volts) and it's been on the charger for 3 hours and still has not completed it's charge cycle.
Any suggestions would be appreciated.
Thanks in advance,
Chris

[chrisg3]

Contacted Duralite and they said it was the balancing circuit in the battery going bad. Duralite said they will replace battery.
Chris