Everyone claims there is no easy way to test life batteries for the remaining capacity at the field. I would like to relate my experience with a tester made by Hyperion. I purchased mine http://www.hyperion-world.com/produc...HP-EOS07SENTRY then tested it. With the push of a button it checks the voltage in each individual cell and rates the remaining capacity by percent. Several times now I have run different packs partially and fully down and checked the status of remaining capacity. For example one pack tested out that it had 50 % remaining. I charged the 3300 mA pack and it took 1800 mA to full charge. All the other packs at differing levels checked out within 10% or less of the checked capacity. I have used this individual cell check feature to recover several lipo packs that have become so imbalanced they fault out when I attempted to balance charge them. I simply charged each cell individually through the balance jack and in all but one case the fully charged cells were within less than .1% of each other.

Dennis