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Originally Posted by Serum
Sounds like it needs a firmware upgrade.
It can charge with a certain amount of power, when the cells get full, the current stays the same, but the voltage gets higher, meaning it needs to put out more watts in total. Since there is a limit in watts it can deliver, it's likely that this is causing the problem.
Sounds like you set it to the maxximum amount of current to charge with?
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Unfortunately, I don't see where the upgrade would be done through. I took it apart and didn't see any socketed ROM chips, nor did I see a place to connect a cable (unless you count the temp probe connector).
As to how the power limit is handled. I've tried it with NiMH and as cells charge up, the voltage goes higher (like you said). But if the 120w power limit is reached, the voltage still climbs, but the charger apparently computes the max charge current based on the voltage, so the current steadily falls. At any point in the charge, you can multiple the voltage by the current and it will be exactly 120w. Kinda like a cross between a constant current and constant voltage source - a constant power source! :)
I've seen some of the issues neweuser has experienced but was able to work around them. My issue was that emolis tend to get out of balance quite a bit when new. They slowly get better after a few cycles though.
It sounds like a call to the dealer for an exchange might be in order.