geosped said:
Thanks the last few rides I did were under 20 miles and I was worn out so that would be perfect for me. It is rather pricy for an 8ah though. At least compared to other larger packs that cost the same or less. Do you have any pics of how you have it mounted. This is the exact battery I was considering with the 40T's. Sounds like this would be a fit if I can get that pack to fit an a bag under the seat. I found a post in one of the BBSHD groups in Facebook that had this battery fit in a bag under his seat. Now it looked a little big but he was able to do it and it looked good. I'm gonna see if I can find that post. He hasn't responded on a link to the bag yet but he did post a pic. This is the same guy that's using the 8ha ebay 52v battery. https://www.ebay.com/.../52V-8ah-Samsung.../233342560598...
Another option that I've seen done with the smaller packs is put them in some sort of hard case and use a couple of aluminum cork screw hose clamps like found in cars. He had two attached to the downtube holding the battery in place but I definitely like the bag under the seat option the best. Does your battery come with a BMS and how long have you had it and or how many miles do you have on it. I'm assuming the smaller packs aren't gonna last as long as they will probably work harder.
the listing says it has a BMS...https://www.ebay.com/itm/52V-8ah-Samsung-40T-21700-lithium-battery-pack-for-electric-bicycle-EBIKE/233342560598?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
~200 miles on it so far over 2 months so can't really speak to longevity.
I just mounted it vertically in the frame bag. I did not want to go the seat mounting route as I have a dropper post and the battery and bag is about 6 lbs - lighter than most batteries but would definitely slow down the dropper a lot.
I love the utility of the frame bag - I can also fit a pump, .5 L of water, clif bar, bike tool, and my phone in there, just not the quality of this particular one.
If you want a size reference, the bike is a 17" surly instigator 2. the triangle looks to be about the same size, if not smaller than yours, but I obviously don't have a rear shock to contend with.