[Elecraft] Fwd: [New post] Ebike charging for long Battery life

[Phillip Lontz]

What me worry?

Begin forwarded message:

> From: ElectricBike.com <donotreply at wordpress.com>
> Date: September 14, 2016 at 7:33:55 PM MDT
> To: philji at mac.com
> Subject: [New post] Ebike charging for long Battery life
> 
> 
> New post on ElectricBike.com
> 
> 
> Ebike charging for long Battery life
> by Eric Hicks
> ]
> Ebike charging for long Battery life
> 
> 
> So you want your battery to last a long time….remember that most people will not ride their ebike 500 times in their lifetime….500 charges is the typical lifespan of a 18650 ebike battery…. And 500 charges will take nearly anyone a long time to get through….. So our first advice is not to worry about it and ride it like you stole it.  By the time your ebike battery is used up, there will probably be some amazing technology around and you will want to replace  your old clunky battery anyway. Also most people will damage their ebike battery from abuse (dropping etc) way before they use it up from natural wear and tear.
> 
> However it has been theorized that you can get up to double the life of your batteries expected life, by taking care when charging.
> 
> Simple Rule To Remember
> 
> 
> Lithium batteries like to stay cool. If you want to make your battery last a long time do not let it get hot, either in discharge or when charging. How to tell if you battery is getting hot? just use the finger test and just put your finger on it. Warm is ok…. Hot to the touch is bad and you are shortening the life of your battery when you get it hot.
> 
> Always Charge Slow When You Can
> 
> 
> Ebike batteries prefer to be charged slowly…. The smaller the pack in amp hours the slower they like to be charged.  If you are concerned with battery life don't buy the highest amperage charger you can find….just stick with a low amperage (2-3 amps) charger, or go with an advanced smart charger which can charge slow or fast with the turn of a knob.  It's always good to charge slow unless you are in a rush. (read more on the benefits of slow charging here)
> 
> When to charge?
> 
> 
> You do not have to charge your battery after every ride…. These are not old school lead acid packs that if you forget to charge you will shorten the life of your pack…. Lithium batteries only need to be charged when needed.
> 
> Where to charge?
> 
> 
> All large lithium batteries are a potential fire risk and should be charged in a safe place, preferably outside or in the middle of a garage floor Other safe ways to charge an ebike lithium battery are in a fireproof bag, oven or barbecue grill.  (read this article on safe charging)  Do not attempt charging a battery you think is damaged.
> 
> Never charge a lithium battery unsupervised inside a house or building.
> 
> 80 90 100 percent Advanced Chargers
> 
> 
> Consider buying a smart charger that will automatically automatically  charge your battery at 80, 90 or 100 percent, and only charge to 100 percent when you are planning long ride.
> 
> Chargers that do this include the Satiator and the Luna Advanced Charger.
> 
> We know from research done by the auto industry that batteries live longer lives when not charged to 100 percent every time ….but at the same time you should charge your battery to 100 percent at least once in a while to ensure its balance charged.
> 
> Watch our video on the Luna charging station pictured above.
> 
> Balance Charging an Ebike Pack
> Balance charging is a function that is controlled by more advanced bms (read article on bms) . What it does is when the battery has reached its peak charge, the cells will slowly be balanced so each line of cells are at the same voltage….this not only extends the range of your pack, it also extends the life expectancy.  Modern name brand 18650 cells are very good at staying in balance, but should be charged to 100 percent once in a while to ensure proper balance is kept.
> 
> Know your high voltage cut off limit
> Always use a charger that is designed for you pack.  If you use the wrong charger you not only risk the long life of your pack it can also become a fire hazard.  Make sure the charger’s maximum voltage matches the maximum voltage of your pack.  Here is an example of maximum charge voltage  for 18650 battery packs. If you do not know what your batteries maximum voltage is find out...and write it on a label on the battery so you never forget.
> 
> Here is an example of maximum voltages for popular luna cycle 18650 packs
> 
> 10s (36v) - 42v max voltage
> 
> 13s (48v pack) - 54.4v max voltage
> 
> 14s  (52v pack)  - 58.8v max voltage
> 
> Know your low voltage cut off limit
> Knowing what your high voltage cut off and knowing what your low voltage cut off is the clear way that you will start to understand your pack and how to maximize its life, and also how to maximize your range when you need it.
> 
> High voltage cut off
> 
> Here is typical low voltage cut off of some popular 18650 packs. Low voltage cut off will vary depending on which cells and which bms.
> 
> 36v (10s)  -  27.5 volts
> 
> 48v (13s) - 36 volts
> 
> 52 (14s) - 39 volts
> 
> Storage of your lithium battery pack
> 
> 
> Do not store your lithium batteries either fully charged or fully discharged….but somewhere in the middle. If you have a smart charger we recommend you charge to 80 percent and store there.
> 
> If you are storing for a large period of time, charge it to around 50 percent and keep it in a fire safe place.
> 
> If you have to choose between storing your batteries empty or full….choose full to keep the battery from drifting down to a level that it cannot be safely charged. The bms will shut down and you can ruin your battery if the battery drops below the low voltage cut off.  The bms is the battery management system that keeps your battery from overcharging or undercharging and monitors the safety and health  of your pack.  (read more about ebike bms)
> 
> Tools that can help you
> 
> 
> Always have a handy multi meter around to monitor the health of your pack.
> 
> You can also invest in a wattmeter, a Cycle Analyst, or a batt-man which will also give you a fairly accurate voltage of your pack, and also give you a good  idea of the capacity of your pack in amp hours as your battery ages.
> 
> It’s normal for a lithium battery to drop in both amp hours and max voltage as it ages.
> 
> Only buy ebike packs containing name brand and authentic 18650 cells
> 
> 
> The last tip we will give you to maintain long life of your battery and the safety of it during charging is when you purchase your battery pack make sure that it is cells are made from a name brand Japanese or Korean company (panasonic, samsung, lg, or sanyo) and that the cells are authentic.
> 
> At this writing China is not good at making their own battery cells, although they have proven they are good at rewrapping chinese cells to look like name brands on the outside, or relabel them as name brands that boast ridiculous impossible numbers.
> 
> Buy your ebike battery from a source you trust, and preferably a USA supplier.   Of course i recommend Lunacycle.com for all your battery needs. (disclaimer i am the owner of Luna Cycle).
> 
> Eric Hicks | September 14, 2016 at 6:20 pm | Categories: Technical, Uncategorized | URL: http://www.electricbike.com/?p=17758
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