Help with Schwinn Izip fallout from Yardworks battery mod!

[AxCrusnik]

Hello everyone
This is my first time posting here and I need your expertise. I recently replaced the battery from my Schwinn Izip (Canadian Tire ebike) with Yardworks Lithium Ion batteries. I think I wrecked the controller and the motor on my bike. I hooked up two of the 21v 6ah batteries in series (many other forum users here have done this with good results). It worked really good and everything seemed fine. On my second trip my bike died suddenly. I thought the batteries were just drained. I charged the batteries and it still doesn't work. I got out my multimeter and checked the battery. It says it is putting out 26v (I think it should be more like 40-42 but it it is still more than the stock battery). Then I measured the voltage coming out of the controller and it said 3 volts (that's bad isn't it?). Lastly, i hooked the battery up directly to the motor and nothing happened.
Do I need to replace the motor and the controller? If I do isn't it likely that they will just get fried again? Does anyone know if Canadian Tire or a bike shop can replace those things for me? Could I do it myself by buying the parts online or something (I am a pretty big noob)?
Thanks for any advice you can give.
Ax

 

[torker]

I would first check connections, any fuses. It also makes me wonder why your 42 v pack only shows 26 after charging. I found a forum with a lot of guys modding those bikes.http://www.ecoforumz.com/electric-bike-scooter/137788-my-ezip-izip-upgrade-round-up.html

Have you been to this forum? Sorry I'm not much help with limited info but there are some guys on there that are really into modding the ezip-izip. Welcome to this forum btw I know there are some folks on here with that bike also. Thinking if you hooks the batt directly to the motor and no go than it may be a bad motor. Was the motor pretty hot when it quit.

 

[wasp]

Hello everyone
This is my first time posting here and I need your expertise. I recently replaced the battery from my Schwinn Izip (Canadian Tire ebike) with Yardworks Lithium Ion batteries. I think I wrecked the controller and the motor on my bike. I hooked up two of the 21v 6ah batteries in series (many other forum users here have done this with good results). It worked really good and everything seemed fine. On my second trip my bike died suddenly. I thought the batteries were just drained. I charged the batteries and it still doesn't work. I got out my multimeter and checked the battery. It says it is putting out 26v (I think it should be more like 40-42 but it it is still more than the stock battery). Then I measured the voltage coming out of the controller and it said 3 volts (that's bad isn't it?). Lastly, i hooked the battery up directly to the motor and nothing happened.
Do I need to replace the motor and the controller? If I do isn't it likely that they will just get fried again? Does anyone know if Canadian Tire or a bike shop can replace those things for me? Could I do it myself by buying the parts online or something (I am a pretty big noob)?
Thanks for any advice you can give.
Ax

hello and welcome to endless sphere
the first thing is check those batteries even if you have to open the case
they should be at at least 30v+ for the pair in series the bms on these are 31amps and if your izip has the same controller as i had it's 35amps and can and will force it to trip under load
measure each battery separately ... what concerns me is when you bypassed the controller it should run
the batteries have a built in fuse

 

[wasp]

anotherthing when you took the first ride at 41.6v did you drive it really hard and burn out the motor?
replacement parts are available at tnc scooters online
its easy to replace the motor

 

[AxCrusnik]

Thanks for the replies and the warm welcome guys.
@torker: I am not sure if the motor was hot. I thought it was just the batteries running out and I didn't think to feel the motor. Thanks for the link. I will check it out.
@wasp: What does it mean when you say it can "trip under load"? Does that mean that a fuse breaks? Is there a fuse on the controller? I saw the one in the battery case but I think it must not have gone since the multimeter still gets a reading off the battery.
As for driving it really hard...I might have pushed it a little but in general I was riding at about 1/2-3/4 throttle. I had the motor going the whole trip but I only went full throttle a couple of times and for short distances. The bike died about 12km into the trip (almost home) so I thought it was likely just the batteries running out.
I don't suppose that the motor itself has a fuse on it? I know almost nothing about the controllers and motors for these bikes. The TNC Scooter page is really overwhelming. Could you post a link to your recommended controller and motor for this bike with this battery? If I invest even more money into this bike I want to make sure to get a motor and controller that can definitely handle these batteries. Should I get a 48v controller? What type and how big of a motor? Do you know a controller that would fit in the same spot as the stock controller and a motor that would fit where the stock motor is without modding the bike?
Thanks again for your assistance.
Ax

 

[AxCrusnik]

I have resolved the issue. Thanks again guys.
It turns out that one of the connections to one of the batteries was broken and so only one battery was hooked up to the circuit. It is still weird that the motor did not move at all when I hooked it up directly but in any case everything is working normally now.
Also, my multimeter was almost dead and wasn't giving correct readings. Now it reads 21v for each battery and 42v total for the whole circuit.
Ax

 

[torker]

Awesome, I love it when it is a simple fix.