how can you tell? For example. There are cheap traxxas chargers on there like the following...go to ebay there are some good one on there that are new in box that car fairly cheep but good. i was say get one that will charge every thing. so when and if you up grade you wont need to buy a new one.
I recently purchased a Traxxas Slash... I was looking for an inexpensive charger... any ideas?