I'm not 100% sure what you mean.....
Are you talking about large and small connectors? or large and small batteries?
Large and Small connectors you'll have to splice and resolder the connectors either on your battery or your charger. Also I would personally redo the connectors with Deans instead of a large tamiya but that's just me.
Large and small batteries pretty much just describe the size of the battery (large will mean you can hold it in a rear stock for an M16 (brick style configuration) whereas a "small" battery means a smaller capacity and usually in a "nunchuck" or "stick" configuration.
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