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Motorized Electric Bicycles The motorized electric bicycle is a quiet and efficient form of transportation for general commuting.

Walmart ebike


Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Electric Bicycles forum. I bet this bike would do pretty good with a 24V lithium pack. Just yank the stock rack and replace ...
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  #21 (permalink)  
Old 04-08-2009, 12:37 AM
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Default Re: Walmart ebike

I bet this bike would do pretty good with a 24V lithium pack. Just yank the stock rack and replace it with a Topeak rack and bag with the lithium. Minimal rewiring and you would still come out way ahead, price-wise. You wouldn't see the performance drop during discharge that you see with the SLAs. Figure $300 for the bike + $200-$250 for the battery + $100 for the rack/pack. If I were building a new eBike, this is probably the way that I would go. WAY CHEAPER than my 36v LiFePO4 kit build!

For another $100, you could go 20ah on the battery at less weight than the SLAs. I have a 20AH 36V that weights exactly 20lbs.

LiFePO4-24v-12ah-BATTERY-FOR-ELECTRIC-SCOTTER-
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Last edited by cvpsmith : 04-08-2009 at 12:40 AM.
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Old 04-08-2009, 09:14 AM
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Default Re: Walmart ebike

I have been thinking this plush a trailer with a sla pack. The trailer in my opinion makes sla batteries very doable. I'm not sure that it make much difference what their weight is if they are rolling along behind. the effort to pull them up a hill might be countered by their added push going down it. Since my hub has regenerative every time is pushes it pust a little of the energy back.

I am not yet a convert to the new batteries and probably won't be till the price drops significantly. but I am a big fan of innovation.
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Old 04-08-2009, 09:32 AM
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Default Re: Walmart ebike

Yea, I've actually been using the SLAs as well. I ride the LiFePO4 to work, then put it on the charger (wherein it gets to trickle charge for about 8 hours). While I'm at work, I use the SLAs to putt around. When I'm ready to go home, I leave the SLAs on the charger at work overnight. Works great! The commute is about 13 mi. round trip, which is nothing for the 20ah lithium. I haven't had a chance to really put it to the test yet...
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Old 04-08-2009, 10:14 AM
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Default Re: Walmart ebike

If my 24 hours have a projected range of about 12 miles that lith should be good for a few more miles. I just hate to get out somewhere and have a battery die miles from home. I'm pretty anal about testing the charge when I get home.

The one thing I do like about my hub motor is that it will not allow the batteries to drain below about 12.25 which doesn't damage them. I used to run my sla on the friction drive down to 11.75 or lower not knowing it was screwing them up.

I still have it in the back of my mind to try flooded cell since this bike won't kill them. The other issue is that the trailer kind of negates the weight factor of a flooded cell batter. I would love to have a reliable formula for converting the flooded cell rating to actual range. I guess in the end I will have to just buy two batteries and try them out. I know it makes no sense at all. I can get a 20 ah rig sla set up for about eighty bucks. I have no idea what eighty bucks worth of flooded cell batteries would be. The only thing the flooded cells have going for them is the availability... i can pick them up a couple of blocks from my house any day of the week.
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Last edited by deacon : 04-08-2009 at 10:18 AM.
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Old 08-19-2009, 04:11 AM
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Default Re: Walmart ebike

Quote:
Originally Posted by offroad View Post
Comments on the Walmart Bike:

1) If you put the battery in wrong the first time, the fuse will blow.
2) The motor is an ASSIST motor. It does not have the power to run the bike by itself.
3) Am not sure if it will help enough going up very steep hills. Will be testing.
4) The motor control has two SAFETY use modes for the motor. a) Power assist after you are moving. b) Power assist after you are pedaling. There is a twist DEADMAN throttle, which only continues working if you twist it.
5) Bike has an extra slot for a second battery pack. You switch between PACK-A or PACK-B depending on which has energy.
I've driven my ezip trailz for 1 year and 8 months now. Almost daily for a couple of miles a day.
1} It's impossible to put the battery pack in wrong. It has slots in the battery case that prevents it.
2} The bike carries my 200lbs with no pedaling and depending on the charge, up moderate hills. I only have one battery pack. The only time I pedal is if I happen to run out of juice.

After about a year, the stock batteries (two 12V 10ah "Enduring" brand Chinese SLAs), were just about fizzled out and I could only go about a mile before needing a charge. Instead of spending $150 or more for a new battery pack from Currie (and the fact that it's almost always out of stock), and instead of spending $70 plus shipping to order two comparable batteries online, I ran across SLAs in a local grocery store that were 12v 7.5ah which cost me $17.99 each. I think they are used for home alarm systems and computer UPS. I took the case apart and installed them and so far they have worked great. I haven't maxed them out since I usually don't make trips over 2 miles total. My max range would probably be about 5 miles. Even when the bike was new, 8 miles was probably the maximum range with the Currie battery pack. I saw someone post here that they went 10 miles and hardly used any of the battery charge. I'd have to see that to believe it.

The bike has been very durable and I ride it on moon crater streets and dirt roads in a podunk one horse town. No breakdowns ever. No flats because I put some gorilla snot in the tires when I bought it.
Top speed 15 mph with no pedaling on a flat road or very slight incline.

Paid $150 for it at Wal-Mart. It was the only one they had and was on clearance. A real steal.
The Wal-Mart I bought it at never got any more of the bikes until recently and they now have two of them and are priced at $398.00. If I keep waiting like I did before, they might even reduce these to $150 and I might buy a new one. Just think, buy an entire new bike for less than the battery pack from Currie.

Mine is a 2007 model. The controller/battery switch is on the seat tube. On later models, they moved the controller to the rear of the bike. I wonder why. Now you have to stop and get off the bike if you want to switch batteries.

Many people are running 36v through this 24 volt motor successfully using the stock controller, but they are drilling holes in the motor casing to cool it. I'm sure it would overheat if you didn't do this. It's a tricky operation to do and I don't want to chance screwing up the motor when all those little pieces fall out.

My biggest complaint is the loud whir of the motor. You can hear it coming from at least 2 blocks away. Dogs, goats and cattle can hear it coming from even further away. I don't like attracting attention, so this whir still bugs me.

The ultimate upgrade for me would be a quality 24v lithium-ion battery pack, which would reduce battery weight greatly plus more range. Wouldn't it be great if a Dewalt or Black and Decker 24v battery packs had at least 10ah? But those batteries are Ni-Cad and peter out after they've sat a few months.

If you plan to buy an Ezip, if you check nothing else before buying, at least check and see if the battery pack will slide into both sides correctly. I discovered long after I bought mine that the right rack was slighly bent and the battery wouldn't slide in. This was a dilemma since the contacts wore out on my left side rack. I removed all the screws from the contact holder on the right side and was able to get the battery in. The contacts probably wear out from all the vibration and bumps from the road, even smooth roads. And I've looked around and haven't found replacements for the contacts. A way to prevent this is wrip a strong bungee cord around the battery pack from top to bottom to minimize vibration. Even this may not prevent it. The connection from the battery to the contacts on the frame is metal to metal and made of copper, so vibrations really take their toll since they are cheap chinese parts like most everything else.

Last edited by geeksquid : 08-31-2009 at 04:41 AM.
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