Just a response from Yuasa that clears up the confusion.
Thank you for your inquiry.
I will be glad to explain the differences between the two.
The YTX24HL is factory activated and the YTX24HL-BS comes with a bottle supply of acid and has to be activated by the dealer or user. If you take a look at the specs for both batteries, they are identical.
YTX24HL:
https://www.yuasabatteries.com/battery/ytx24hl/
YTX24HL-BS:
https://www.yuasabatteries.com/battery/ytx24hl-bs/
If the battery lays at an angle inside your Spyder, we recommend going with a factory activated battery. If it sits upright, you can go with either one.