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Deans connectors are easier to find at hobby shops, it's pretty common for usage with R/C stuff. Costs about $6 per full connector, comes with heat shrink as well.
Tamiya connectors, doesn't matter the size, aren't very reliable at times since the nature of the socket allows the diameter (femalre contact area) to spread, and the type of crimp (butterfly type) actually cuts strands as it's crimped. Better to use needlenose pliers to fold the sides over the wire, and solder the front part of the wire to the contact, and have the rear part firmly folded over the insulation. That gives the best contact and strain relief for those types of connectors.
Keep in mind, that most often, the 'key' of the mini connectors (you have a square on one side and a circle on the other) are generally the opposite of what large connectors are. Depending on your charger type and if it can handle a mini connector (most good chargers only do large Tamiya types) you'll need an adaptor to go from large to small. I put large connectors on my mini batteries, one ended up shorting out my charger and the fuse blew. Turned out one of them, I wired up the large connector the same way as the mini was, and had them ass backwards.
Honestly, Deans connectors are smaller (a full Deans connection is the same size as half a large Tamiya connector) and much more reliable than any of the Tamiya connectors, and it's pretty easy to make an adaptor for your charger to switch back & forth between large and Deans connections.
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