kfong wrote:With all my break downs this past year on my Motobecane, I'll be glad to get this one running next year as a backup. My big concern is using Lipo's. I plan to install them in the triangle frame on this bike as well as up front in the forks. I have been avoiding Lipos, until this year. I now have a plan that I'm comfortable with on how I want to charge the packs, but need to get boards sent out to implement this.
For those who are actually doing a lot of trail riding with Lipos, have you had any issues I need to be concerned with? I'm worried about all the pounding and possible abrasion they will encounter. I plan to balance charge each time to avoid any surprises like I found recently on my Konions. This will force a safety check during each charge, since I will not be able to visually inspect them each time. With all the vibrations and pounding of trail riding, I want to reduce all possible problem areas. I will be making a custom battery holder like I did with the Motobecane build, as well as a fiberglass cover. This time around I plan to use nomex as part of the shell in case of fire and vent holes to direct it. I plan to have the battery tied down as secure as possible with a thin layer of foam for impacts, but mainly as a cushion between the frame and pack.
for me, its early days, but so far so good. Im using these http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=15521
inside a padded pvc case. Had a small crash the other day where the bike slid/bounced down a rocky embankment on its side, but didnt seem to have effected the batterys or cases at all. Im bulk charging 90% of the time too, just using some temp probes and some 8s monitors to let me know if anything is getting messy (high temp alarm + delta V and High V alarms). Im planning on balance charging every 10th cycle or so, so I can monitor if any of the cells IR or capacity changes dramatically. Afgter seeing the abuse that the more modern lipos can take im not tooooo worried, im more 'very cautious'. the IR+temp+capacity should tell me if any cells are going bad, particually since I cant see if these are getting puffy
Id say just pad them fairly well, so they cant move due to vibration or shock, and then make sure the case can take a few knocks. abrasion shouldnt be an issue if you keem em from moving, so build a tight fitting case (or use plenty of padding). And temp probes are a good idea, since you'll be able to see if any packs are warming up excessively compared to their neighbours, a good indication that something isnt right (unless you've just parked it with one side in the sun).