RE: Super Nova 250S
Your charge mAh figure only tells you what went in. The discharge figure is the meaningful one as that determines how long your model flies.
If you can't reach the charge amperage figure selected it may be due to insufficient PSU capacity or excessive lead resistance. Measure the 12v input supply while charging.
An inability to discharge at the programmed rate can be due to excessive lead resistance. The SuperNova also finds it difficult to discharge single cells at a high rate. It is also incapable of dissipating large powers. E.G a 20 cell pack at 5A would be over 100W. Using a car/truck battery as the power source it may be able to return some energy to that battery reducing the power it must dissipate as heat.
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Steve