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I REALLY prefer the pirahna because it charges the battery a lot better, you can adjust current and you have a LCD display showing current voltage and current. It also give a good idea of the actual capacity your battery is holding.
It does not discharge, but I found that the TLP chargers tend to be very inconsistent on the discharge. Best thing to do it to get 5 car headlamps (the cheapest ones) and weld them in parallel. You will get a 5A discharger an then you just need a voltmeter to monitor. Gives a lot better results than any other technique used... discharge your pack at 0.9v/cell, so a 9.6v pack (8 cells) should be downed at 7.2v (dont go further)
if you have a mini pack, you should be discharging at 10A... I thing the TLP chargers are doing 2A....
A large pack should be between 25-30A. (That means 30 light bulbs... takes a lot of space and generates a lot of heat. but 5A is ok....)
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