i do in a 4.5 litre Topeak Midloader frame bag. This will carry a Bosch powerpack with enough extra room for an apple or an orange.Does anyone have a spare battery that they carry when going outside their expected range? If so, how do you carry it?
In a pannier.
When you carry it in a pannier on one side does it affect the feeling of balance?
Batteries in a trunk bag or pannier are definitely subject to abrasion against other items in the bag with all the jiggling and vibration of a bike on road or trail. I highly recommend getting a neoprene battery jacket. They are useful for cold weather/winter cyling and they will keep the case from getting scratched or damaged while being transported.
Which begs to be asked, how do you adapt a lawnmower battery to your bike.Batteries are heavy. I don't carry one but if I was of the mind to......
My bike is 36 volt. My lawnmower is 40 volt. For an emergency use, I'd take that. Much smaller and still gets you a good ways.
I dunno, but all the lawns along your route look AWESOME!Which begs to be asked, how do you adapt a lawnmower battery to your bike.
I originally carried a spare on top of my rear rack but the higher center of gravity adversely affected balance. The extra weight is better carried as low as possible. I switched to using a pair of small heavy duty panniers that are only slightly larger than the battery. I fill the extra space with an article of clothing for padding. I carry my tools and other gear in the opposite pannier to help balance the load.
If you go this route, make sure the pannier you use is strong enough to carry the battery weight.