I've got an MRC Super Brain 969 Pro, and love it. It's about $130; you can charge two packs of different types or voltages at the same time, or charge one and discharge one at the same time. It comes with an AC adapter so you can use it on household current , or you can use a 12V source such as car battery or field battery. It's a delta peak charger, when it senses full charge on the battery, it goes to a maintenance / trickle mode. You can select how long to charge, or charge to a specific capacity, or determine the charge rate. The charger automatically detects how many cells in the pack, and when you first connect the battery to the charger, it shows the state of charge. If you need to quick charge, just hook up the battery and press start, that simple. It beeps when full charge is reached. It will charge NiCads, NiMH, and LiPoly's, just follow normal precautions on charge rate with LiPoly's. The charger is very compact.