If you're thinking of making a purchase for an LTO battery from a place like Aliexpress, I'd strongly suggest you think twice about it.
I bought a 48V 40ah battery - and it's been a bad experience. Battery didn't work properly: had much lower voltage and capacity than advertised.
Upon opening the battery to look for obvious issues (broken wire or ???), I find the cells inside are dated... 22-May-2016!!!
My AliExpress dispute went poorly, my appeal ignored, and because of the extremely lengthy delivery time, I couldn't open another dispute. Jeez. Thanks AliExpress. My days of dealing with you have just come to an end.
Product link: https://www.aliexpress.com/item/4000529784733.html
I'll write a WHOLE PILE MORE about this long sordid tale soon, so please check back.
Update 28-May-2020: Seems I'm not the only one who's had trouble with GTK LTO batteries from Shenzhen Facewell or Shenzhen Fuxiang (name has changed) on AliExpress.com: