I own a biktrix Ultra 1000 EBike it’s the hard tail version of the red bike above. FYI these are built by Frey bikes in China the batteries are called Dorado battery I own a 48-52 v 21 ah battery as my main battery but also have a 48v 11 ah battery for a backup. It’s a great system the cells are panisonic or LG 21650 cells the 11ah battery is about 7lbs where the big 21ah battery is about 11lbs these run from 300$ for 11ah to 900$ for the big 21 ah battery so having a backup that is lighter weight is definitely affordable. The nice thing about having a spare battery besides the obvious is to troubleshoot your system if you are having issues. I highly recommend it.
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