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Old 09-16-08, 12:02 PM   #1
heather1980
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Red face Ampedbikes kit, battery help

Hi, I have been commuting 22 miles each way to my work every day. I average about 22 mph pedaling along with assist. But the last 2 days my batteries are cutting out. I haven't had any problems for over a month but now its cutting out. I am using 3 12v 12 amp hour batteries how do I check to see if one is bad?

Ive been having a great time commuting this way and feeling good at work all day but now that it is cutting out its a bit harder.. Can someone help me check to see which battery is bad?

THX.
Heather!
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Old 09-16-08, 12:59 PM   #2
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first question to ask yourself is, have you established that the problem is the batteries rather than the motor or controller?

The fiddly electronic bits are often the culprit in an e-bike breakdown, so e-bike controllers are often the place that things go wrong.

If you have sealed lead acid batteries, one thing you can be thankful for is that they don't have any fiddly electronic bits. However, if you run them down to zero twice a day, 50 round-trip commutes might be about all your batteries can do. If you want them to last longer you'll need higher capacity batteries (so you don't run them down to zero) or else batteries that are not lead-acid.
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Old 09-16-08, 01:18 PM   #3
heather1980
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Yes, I used my husbands batteries and no problems. So I'm sure its just a bad battery or bad batteries.. When I get to work they are only run down about 60-70% because it only takes about 4 hours to recharge.

Can you suggest a bettery battery or a way to find which battery is bad?

Thanks for your help!!!!
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Old 09-16-08, 06:55 PM   #4
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A volt meter will tell you how your battery is doing. For example, if you charge all your batteries up and see that one is 12v and the others are 13v, that means the 12v battery is bad. (batteries that are rated 12v should be 13v when they're fresh off the charger.)

I bought a multimeter (can measure voltage, resistance, and DC amperage) for something like $12 and it's pretty useful.
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Old 09-18-08, 04:58 PM   #5
heather1980
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Thanks Cerewa!! I found the faulty battery, replaced it and back on the road!
Although after testing it I was messing with the buttons on the voltage meter and I seem to have blown it out somehow lol
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Old 09-18-08, 09:12 PM   #6
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You may have just blown the fuse in it. Some extras may have been supplied with it, if not they are cheap at the store you purchased it at most likely. (If not radioshack should have some)
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Old 09-20-08, 01:04 AM   #7
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That usually happens when you try to measure a voltage with the meter set to measure amperage.

I have done it so often, I always keep a spare fuse.
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