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Old 10-23-15, 04:07 PM
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Need4SpeedFLA
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newguy

Hello everyone. First time here. The big Q is my 250W rear hub bike has lost top end speed (22mph) down to 16mph with 4000 miles logged. No complaint about that. I just replaced the 36W 10Ah Lion battery and only increased to 19 mph. What would be the cause? the swtich, BMS or the motor? Do I need to open the hub and clean the motor? Please dont trash me if I was supposed to but this bike has been a gem so far.
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Old 10-26-15, 10:25 AM
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chas58
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Kinda strange. Do you use throttle or PAS? It sounds like your PAS had its level of assist knocked down a bit.

Battery wise, speed is generally determined by volts, power by amps, and range by amp hours.
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Old 11-03-15, 12:49 PM
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Thanks

Battery wise, speed is generally determined by volts, power by amps, and range by amp hours.

This is my first ebike. Its 36V 10Ah (silverfish) battery with a 250Watt rear hub. It has kicked butt for 10 months and all of a sudden Im down to 15mph whereas I was getting closer to 20mph. I replaced the battery with no improvement at all except for possible range. I cant find out if I am supposed to clean or maintain the hub motor or not. The battery I am affraid is a chinese knock off but so was the original...??? Thanks for the reply!!
PS can I upgrade to a 48Volt battery with my 250W hub?
and what about Ah limits?
What can I use with that hub? I actually am satisfied with 250 W but willing to go for 500-750..Any advice is appreciated.
Mark
Orlando FL
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Old 11-03-15, 04:46 PM
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A 36V battery should read about 42V after charging. I would test both batteries after charging (Harbor Freight Multimeter is only about $5.00). Your motor is almost certainly geared and shouldn't need service after 4K miles. Additionally, the original battery should have had a life of more than 8 months. After you check both battery's voltage, ask the Q on endless sphere where there are many experts willing to assist. Hope that Dogman Dan or Dveh answer.
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Old 11-04-15, 11:53 AM
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Originally Posted by Need4SpeedFLA View Post
Battery wise, speed is generally determined by volts, power by amps, and range by amp hours.

This is my first ebike. Its 36V 10Ah (silverfish) battery with a 250Watt rear hub. It has kicked butt for 10 months and all of a sudden Im down to 15mph whereas I was getting closer to 20mph. I replaced the battery with no improvement at all except for possible range. I cant find out if I am supposed to clean or maintain the hub motor or not. The battery I am affraid is a chinese knock off but so was the original...??? Thanks for the reply!!
PS can I upgrade to a 48Volt battery with my 250W hub?
and what about Ah limits?
What can I use with that hub? I actually am satisfied with 250 W but willing to go for 500-750..Any advice is appreciated.
Mark
Orlando FL
Not to be picky, but 36v & 10Ah is 350 watts.

If you don't have any hills, or spend any time at high power and low speed, you could probably get away with 48 volts. Need to figure out that speed problem though.
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