How reliable is this?
- Thread starter crE
- Start date
it's normal to have all LEDs still up after 20 miles if you pedal.
when all LEDs are lit, the battery capacity is above 50%.
when the two outside red LEDs are off (after about 25-30 miles), the capacity is somewhere between 25% and 50%
when the next two green LEDs are also off, you have less than 25% remaining.
It's best to use the trip mile count or odometer for more acurate estimate of remaining battery capacity. If you reckon you are an average pedaller, you get about 55 miles on a full charge. Lose a few miles if you have hills. Even if you don't pedal at all, you'll still get about 40 miles out of a full charge.
when all LEDs are lit, the battery capacity is above 50%.
when the two outside red LEDs are off (after about 25-30 miles), the capacity is somewhere between 25% and 50%
when the next two green LEDs are also off, you have less than 25% remaining.
It's best to use the trip mile count or odometer for more acurate estimate of remaining battery capacity. If you reckon you are an average pedaller, you get about 55 miles on a full charge. Lose a few miles if you have hills. Even if you don't pedal at all, you'll still get about 40 miles out of a full charge.
these things measure the battery voltage, which is not an accurate way of measuring the state of charge of the battery because of the Peukert effect.
http://batteryuniversity.com/learn/article/calculating_the_battery_runtime
The voltage relates to the state of charge. You can use the chart below to work out the state of charge. The different plots illustrate the Peukert effect - when you hit a hill, the battery is discharged fast, the voltage drops faster than if the effect wasn't there (hill = green, 2C versus flat =0.2C), so it looks like you use a lot more battery than you do in reality. To understand the Peukert effect, follow the horizontal line: after using 20% of the battery on hills, the voltage is 3.7V (green plot), the LEDS will (wrongly) show that you have used 80% and have only 20% left (black plot). Leave the battery to rest a bit after a big hill, the voltage will come back to normal.
http://batteryuniversity.com/learn/article/calculating_the_battery_runtime
The voltage relates to the state of charge. You can use the chart below to work out the state of charge. The different plots illustrate the Peukert effect - when you hit a hill, the battery is discharged fast, the voltage drops faster than if the effect wasn't there (hill = green, 2C versus flat =0.2C), so it looks like you use a lot more battery than you do in reality. To understand the Peukert effect, follow the horizontal line: after using 20% of the battery on hills, the voltage is 3.7V (green plot), the LEDS will (wrongly) show that you have used 80% and have only 20% left (black plot). Leave the battery to rest a bit after a big hill, the voltage will come back to normal.
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