RESULTS:
The charger did a self check on the battery regularly at each minute mark during the charge. I noted all of the information on a minute by minute basis. I don't want to do that again. I used Hyperion 720i at 2C in balance mode for a 7.2 volt LiPo 2,000 mAh that was in store capacity before I started charging. TCS Capacity was at 100%.

Total charge time: 41 minutes and 32 seconds
I didn't check the individual cell voltage, but total battery voltage reached 8.4 volts within the 1st minute of charging at 4 amps.
For the next 40 minutes, charging current slowly declined and the input voltage of 13.8 volts remained constant.
The battery took a total of 859 mAh and had an internal Resistance of 48 milliohms. Cell #1 was at 4.19 volts and #2 at 4.19 volts.
Battery and wires remained cool the whole time.

I am now charging an identical battery under the same circumstances except at 1C this time to see how long it takes to charge. I will never do this again. LOL:lol:LOL

At 1C (2.0 amps) full charge took 45 minutes and 33 seconds. Total input 825mAh.

I thought that at 2C (twice the capacity), charge time would have been cut down by quite a bit, but it didn't. The charger I'm using must seriously monitor and regulate the amperage regardless of what you manually program it to.

Maybe this was the problem: There is one menu in the charger that I didn't understand. When I set the charger to charge at 4 amps, one of the sub-menus says "C: 4.0 amps D: 2.0 amps" Does anybody know if this could have increased the charge time when charging at 2C?

The charge times will only vary significantly if the lipo is really suitable for the higher charge rates. Suspect this was the premise of Gulio’s question.

High charge rate capable lipos spend less time in the slower CV portion of the charge. Probably see more difference if the lipos were discharged further of course, but based on what you have seen so far I wouldn’t expect much.

The last question, it’s just telling you it is set for a 4 amp charge (C), and a 2 amp discharge (D).

This is exactly what's going on here.

Got it. What a disappointment!!! Oh Well! In any event, it was fun figuring it out and I ended up with a better understanding of batteries and my charger.

I have a few questions about my charger. 720i.AC

#1 The "D" rate was automatically set at 2 amps when the "C" rate was manually set at 4 amps. Can the D rate be changed to 4 amps?

Second, I always discharge in STORE mode. Would anybody recommend the discharge mode? I've been told "no" for LiPo.

Third, What is the Cycle mode used for?

Thanks for all your help!!!

The D rate is limited by the 50watt discharge limitation of the charger. From your manual "Note that depending on the voltage of the pack, the current you set may not be obtainable if the total Volts multiplied by Current (A) exceeds 50W." There may be a linkage from the LIPO Max screen choice which is set at 2C by default.

I don't have that charger, but there may be other limits imposed if you're on AC power. Try setting the default Max C higher and see if that lets you set the D rate higher as well. With 2S lipo, you shouldn't be bumping into 50watt based current limiting, but it is limited to 5amps regardless.

That charger is built to charge other chemistries, NiMh are discharged for maintenance and they are cycled as well typically after not being used for a while to bring the mah back up. Lipo doesn't need discharging (seems to be a waste) except for storage purposes and that can be slow. I tend to discharge in an RC if I need too, its a lot faster.