I have a 'PIRANHA DIGITAL PEAK CHARGER' $65US. It does everything well, but doesn't have a discharger built in. You can usually get one for around $15US if you look around. It's important to remember that your batteries worst enemy is heat. Your battery will heat up as you charge it. The higher the current you send to the battery, the hotter it gets. Conversely, the lower the current you send, the cooler, but slower it charges. Also, a smart charger can automatically regulate this and you can alter the sensitivity to allow it to get to maximum charge more accurately, but also slower.
Basically it all comes down to time. The slower you charge your battery, the better life you get out of it. If you cannot set things like current, sensitivity, and capacity on a charger, I wouldn't get it. Good chargers will stop sending a current when full charge is achieve, and/or will only send a very slight current (trickle).
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