Normal battery behaviour

[Coolin]

I have a Giant Quick e with a 500 watt battery.
I cycled 31 miles yesterday before the battery died. It was a very hilly area (2500 feet of climbing) and i'm very heavy so I wasn't surprised that it died. It was more the speed at which it went from 20% to 16, 10 then 4 and off!!
Is this how batteries normally discharge or is something going wrong?

 

[KirstinS]

Sounds pretty good to me ! That's a fair bit of climbing and a good distance . Especially if you are, in your own words, very heavy

And yes , lithium tend to start at 4.2v per cell then quickly go to 4.0v gli g down to about 3.4v slowly over their discharge

Then very rapidly go lower to whatever point t the system cuts power to prevent battery damage. Say around 3.1v

Long story short...sounds normal to me fella

 

[Coolin]

Thanks - I did wonder. So the lesson for me is don't be reassured by the 20% power! Pushing a 22kg bike up a hill is no fun!!

 

[KirstinS]

Thanks - I did wonder. So the lesson for me is don't be reassured by the 20% power! Pushing a 22kg bike up a hill is no fun!!

Nope !

Give it a it od practice. You'll quickly learn how your bike, battery and indicators behave. They are are way more vague than a petrol gauge imho

 

[KirstinS]

On one of my bikes I get worried when it says 50 % as I know that really means I'm on my reserve 20 %

The LCD says 100% for ages and then drops fast

 

[vfr400]

I have a Giant Quick e with a 500 watt battery.
I cycled 31 miles yesterday before the battery died. It was a very hilly area (2500 feet of climbing) and i'm very heavy so I wasn't surprised that it died. It was more the speed at which it went from 20% to 16, 10 then 4 and off!!
Is this how batteries normally discharge or is something going wrong?

When a battery is charged, it's 42v. When it's discharged, it's 31v. That's why many batteries appear to accelerate downwards. It's like a petrol tank thats 4 ft wide at the top and 3 ft wide at the bottom, so it you use fuel at ghe same rate, it'll go down faster and faster.

 

[Coolin]

That's exactly what happened. The percentages went down so quickly. When the battery went off it was like someone hit the brakes!
Thanks for all the replies

 

[soundwave]

with a dongle i can get about 25-30 miles from a 500w batt the display is way out lol