Generally the bigger the physical battery size the more mAh they have and the more power they are capable of putting out.
mAh, or milliAmp hour, is a good indicator of how long a battery will last on a charge at a given amp discharge rate. To put it another way, if you are vaping at 8 watts, the battery with the higher mAh rating will last longer before you have to charge it again. If you want a battery to last longer, chose the 18500 over the 18350.
The
specifications for the Itaste 134 Mini include the following for the battery;
"IMR high drain 18350/18500 (without protection, maximum current output is more than 5000mA.)"
5,000 mA is equal to 5 amps, so the batteries you get need to be able to output 5 amps continuously. This is the most important specification you need to know because if your batteries can not do 5A they could become dangerous in use.
I have a bunch of batteries in most sizes for vaping and my
18350 and
18500 are AW. In my opinion AW have the best performance and last the longest in these sizes. The links go to RTD Vapor who are official AW resellers in the US and do not sell counterfeits. AW batts in these sizes are quite popular and are some of the most often counterfeited batteries on the market, so getting them from known, good suppliers is important. The vast majority of AW batteries on Ebay and from China are counterfeit.
You will notice that the bigger of the two AW batts are 18490 instead of 18500. That's OK, the 18490 will fit just fine.
Hope this helps
