Temperature during storage: Optimal storage is 40 to 50% charge, between 40 to 60 degrees F, but room temp is fine. If you live in a city like Denver that regularly sees temperatures listed outside the "OK" range of 30 to 85 degrees, how you store and charge your battery is more important than whatever the temperature happens to be when you're riding. Keep in mind that a dark battery case in direct sunlight can make a battery heat up to much more than the ambient air temperature. Pushing a battery towards the edge of the "OK" range is very unlikely to cause failure, but it will diminish a battery’s life more quickly than operating inside the ideal range. Any time spent beyond the extreme range can be very detrimental. Temperature during use: Risk of damage increases as a factor of how severe the temperature is, and how much time is spent at that temperature. Just like us, e-bikes can tolerate a fairly wide range of temperatures for short times, but are best kept inside an optimal range for the long term. Short answer: It's comfortable when you are. What temperatures are safe for charging, using, and storing my eBike battery? If, however, your situation allows you to take multiple short trips on a single charge, waiting until the battery is between 20 and 40% to top it back off can extend your battery’s life by reducing the overall number of charge cycles, and the amount of time spent charging near 100%. Topping off a battery when needed is always fine, especially if you’re careful with charging and storage temperatures. In extreme cases, the excess voltage can be a battery killer. The second is that batteries are much more vulnerable to heat damage when they are fully charged. The first is a reduced capacity over the life of the battery due to the repeated stress of charging past ~80%, which takes much longer than the rest of the charging cycle. Topping off a battery after each use has a couple of risks. On the other end, if your commute is ten miles round trip and your battery gets 60 miles on a complete charge, top it off at the end of your five-day work week instead of every day, because. For example, if your commute is 20 miles one way, and your battery (on an average day) gets 40 miles on a complete charge, we’d recommend buying an extra charger to keep at work so that each one-way commute takes your battery between 80 and 30%. It’s fine to do when you’re getting the most out of your bike and pushing the battery’s range, but if your routine allows it, partial charging will keep your battery’s stress levels low and capacity high. Running a battery all the way down (complete discharge) and recharging it fully will reduce your total amount of charge cycles, but will also mean that every charge cycle goes through the two most stressful portions, which are 0 to 20% and 80 to 100%. When a battery is near the extremes of 0% or 100%, the charging process is far more lengthy and stressful than in the middle of its range. Even though battery durability is often stated in terms of total charging cycles, it’s the stress of charging that degrades your battery’s capacity. This is different from the days of NiCad and NiMH batteries, when there was a risk of losing capacity if the battery was repeatedly recharged after being only partially discharged, but lithium ion batteries do not have a memory effect. Long answer: Partially charging a lithium ion battery between 20% and 80% is the best way to maintain its total capacity for as long as possible.That said, do what you gotta do to get where you gotta go. Treat it like a gas tank don't let it get so low that you're nervous about running out, and don't bother topping it off above 50% unless you need to. Is it better to run a battery all the way down to 0%, or to top it off after each ride? What’s the best way to charge (or not charge) my eBike battery? That said, there are things that can extend or reduce your battery’s life over hundreds of charge cycles, so we did the research and distilled it down to a few key habits and situations to avoid in order to help you get the most out of your e-bike. A quality lithium ion battery will prove reliable even if you regularly push its limits. You may have even purchased your bike specifically because of its range, so ride it and don’t sweat it. There's no need to fear using your battery. Your e-bike is a wonderful, enabling tool meant for everyday use.
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