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    Nissan Leaf Cells Test Data

    If we use how Nissan manages the LEAF batteries as an example, we know the following: 1. The battery warmer turns on at -4F (-30C) and then turns off at 14F (-10C). It only does this to make sure the electrolyte doesn't freeze. 2. There is no issue with discharging the pack at cold temps at...
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    Nissan Leaf Cells Test Data

    The layout of the modules in the LEAF pack has not changed for all production LEAFs from 2011-2015, though Nissan did change the design of the can for 2013+ LEAFs to reduce weight and cost. 24 modules are stacked on their side on the rear of the pack, 8 modules are stacked flat 2 high in front...
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    Nissan Leaf Cells Test Data

    I have a LEAF and the CAN bus tools to read individual cell-pair voltages along with pack voltages. A "100%" charge - which the LBC claims is around 94-95% absolute capacity - has the total pack at 394V - 96 cells in series so that comes to 4.104V on average. Typically you see anywhere from...
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    Nissan Leaf Cells Test Data

    4.18V seems very high when Nissan only charges them to 4.10V (or maybe 4.11V). A 80%/long-life-mode charge only charges them to about 4.02V. Will be interesting to see how long they last for you. How long do the cells sit fully charged before you use them?
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    Nissan Leaf Cells Test Data

    Long video, but worth watching. Specifically talks about the LEAF batteries along with others. Why do Li-ion Batteries die ? and how to improve the situation? pxP0Cu00sZs
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    Finally bought one

    Starting voltage seems high if you care about pack longevity - you will get more range out of the pack that way but for how long? The LEAF for example only charges to 4.10v at "100%", 80% is around 4.01V and once you get down to around 3.5V you're pretty close to empty. Car shuts down at 3.0V...
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    Nissan Leaf Cells Test Data

    WTF. I'm surprised the package didn't light on fire. That's a good reason right there not to buy random loose cells off eBay. Buy them in the can!
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    Nissan Leaf Cells Test Data

    I can't tell you how much of a difference in cycle life it will make going well above 4.1V, I can only tell you what Nissan does with the cells. FWIW, I grabbed a full-load (80kW indicated) data point for you from my LEAF this morning. Keep in mind the LEAF has 48 of these modules. Data is as...
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    Nissan Leaf Cells Test Data

    Yes, I think it's a good idea to limit your voltage a bit more. It will reduce your usable capacity now, but it should improve it down the road. How much imbalance are you seeing at lower SOC? Nissan also top-balances the pack. When charged to 100% balance is typically around 30mV or better...
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    Nissan Leaf Cells Test Data

    I have a LEAF, and the motor pulls 80kW+ at full throttle, so that is over 3C. Voltage does appear to sag pretty significantly, I'll try to get some data. Nissan does not limit power until well after the cells have lost 30% capacity - don't know if anyone's gotten them to lose much more...
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