I use them, and have done several big trips with them, including a world motorcycle altitude record for several weeks in sub freezing conditions in the Andes mountains, and 3 months off road across Russia, Mongolia, Siberia, Kazakhstan.
The batteries are easy to warm up when cold, simply by cycling them (put a light on for 30 seconds a couple of times - that warms up the batteries inner circuits and gives it much more starting power if its cold. Warming up a 3 kg lead acid battery, by contrast, is a huge job)
The problem comes if for some reason you drain the shorai battery. Because any lifepo4 battery doesnt like deep discharge and cant really be fully charged up again using alternator power alone. Cells need to be balanced.
I actually take a the special shorai battery charger with me. With the battery at around 0.5 kgs, and the charger unit also at about 0.5 kgs, the whole lot together is still 2 kgs lighter than any suitable lead acid battery.
I not only take the special charger with me, I have had to use it on many occasions ... i.e. it is not just a precaution, its necessary on a long trip. When I have a day off the bike or an doing some servicing, I typically plug the charger in to rebalance the battery anyway.
Absolutely you can use the batteries, but I would NOT recommend a major trip or going to remote areas without taking the special shorai charger
Last edited by colebatch; 27 Aug 2013 at 05:21.