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Old 09-25-13, 06:11 AM   #1
tim961
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Izip Zuma battery issue

I bought Zuma last Winter and I really enjoy riding it. I have ridden about 60-70 times this year and have traveled about 750 miles. My problem is I seem to be losing battery range as the Summer progresses. I am averaging around 16-17 mph on my rides which means I am using the pedal assist and also some throttle the keep that pace. In the Spring I could go 18-20 miles and still have some battery left. Now, I am going about 10-12 and the battery goes down to almost nothing. I need to save some battery to go up a 150 foot hill near my house and I hate it when I run out before that as I have some lung problems. My question is this: I have 41.2 volts showing on my multimeter after the battery charges. does that mean the battery is ok and maybe something else? Is there a way to test the battery beyond just taking a reading after it is charged?
Is there perhaps a small backup battery to help get me up that hill in case the main battery goes completely down? Thanks!
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Old 09-25-13, 09:06 AM   #2
SpecialX
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If the battery is a lead acid battery, your range will decrease slowly as time goes on.

If it's a lithium ion battery, the lessened range is probably because the battery cells are out of balance..

How long between riding the bike and charging it? How long since the bike sat without being ridden and now?
What were your charging habits?
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Old 09-25-13, 09:23 AM   #3
tim961
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Its a lithium battery. I should add that the bike is a 2011 and I I bought it used. I ride every other day at least and charge it each time I return. I disconnect the charger when fully charged
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Old 09-25-13, 02:28 PM   #4
SpecialX
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Leave it plugged in for Three days...
that will give it time to balance charge the cell groups..
Then do another test ride.. If it goes up a little, then leave it plugged in for a week and try again... If it goes up again.. Then charge it for another week...
if the range hasn't changed after being plugged in for three days, then your battery is what it will be at and will only get worse after another month or so and then it's time for a new battery.
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Old 10-04-13, 06:24 AM   #5
tim961
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I broke down and bought a new battery and it made all the difference in the world! I was concerned at first because when I tested them fully charged they both show around 41.6 volts but the new one lasted twice as long. I'm not an expert so I'm not sure why that is. I was wondering if there is a place where I can send a lithium battery to get serviced or rebuilt? They are too expensive to keep buying new ones.
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