Electric powered bikes, bicycles with motors Stories about electric bikes, powered bicycles

10Oct/130

Winter is Coming (Prepare to batten down the bike battery)

my-electric-brompton-s-first-boat-tripA few months ago an older gentleman named Steven came to us, looking for an electric bike to help him up the steeper hills, down the longer stretches, and keep pace with his wife who, according to Steven, "rides at a she-woman pace."

Steven ended up purchasing the electric brompton bike, one of our best folding bikes, fit with a powerful electric motor, and since has kept in touch, writing a great electric bike review of his bike for us, posting on our facebook with pics of his bike, and providing a steady stream of clever and beautifully written anecdotes about his bike and his many adventures.

Most recently, Steven shared a post of his on FB, all about preparing his electric brompton bike for the impending winter season:


"Winter is Coming (Prepare to batten down the bike battery)

Brompton in the snowThis morning driving to work I turned on the seat heaters for the first time after last winter. Oh Oh...the good times are coming to a close.

This is Rochester, NY. In traffic my mind will ramble and I was thinking that with early dark and colder weather, my Brompton E-bike will soon be sleeping with the bears until spring. Sure, I see folks on bikes in mid-January on ice-coated streets, but I suspect that most buyers of electric bikes do not fall into that living-on-the-edge, gotta-be-nuts category. I sure don't.

Which led me to muse about that expensive battery and how to store it for the winter. I got to work and Googled Li-ion battery care (my "boss" is my wife and I can get away with that performance-review killing behavior, I'm underpaid, anyway).

Bottom line: the battery needs to be stored away from cold or heat; under moderate temperatures in the 40-65 F range. Freezing temps and high heat is good for battery sales but bad for you.

More interesting, do NOT store the battery fully charged. It puts excess stress on the cells. Ideally the battery should be charged at 40 to 50% of full charge. How to determine that I haven't a clue, but that is the guideline. Recharge the battery a bit every month or so to make up for normal discharge. There is a lot of information online but it is clear that a bike battery cannot just be left in a corner of a cold garage.


my-electric-brompton-s-first-boat-trip-1Thanks again Steven for the great post, and for making a few good points that everyone should keep in mind while preparing for the winter.  If you plan on being beset with snow and think you won't be riding your e-bike for awhile it is important, as Steven mentions, not to let your battery sit unattended for a long period of time.  We've definitely gotten some calls from those who left it until to late and ended up with a battery that was so low it couldn't recognize a charge.

Steven also makes a good point that it's better not to store a Lithium ion battery at completely full charge, as it will put a strain on the cells to maintain that energy.  To estimate the charge of a battery, it's easiest to use a console that can measure remaining charge.  The electric Brompton comes with such a console, which indicates when the battery is at %100, %75, %50, and %25.  This isn't an exact estimate (Steven is currently in the process of finding more exact methods of determining battery charge) but it will be close enough to determine a safe storage level.

Always a pleasure Steven!  Looking forward to hearing about your next adventures on the Electric Brompton Bike!

Jack