Electric Bikes - Best deal on a 10Ah36V LiFePo4 battery pack?

I'm looking on purchasing this battery for the E-zip bike.

The best deal I have found so far was $568 which includes: 10Ah36V LiFePo4 battery pack in bag+BMS+2A charger ( 6 hours).


I was wondering if anyone has found a better deal?

where did you find this?

That's right around what I paid for my 20AH pack.

Someone else posted this link, they may be worth checking out.

http://www.falconev.com/batteries.html

$319
http://www.pingbattery.com/servlet/the-8/36V-12AH-LiFePO4-Battery/Detail

I noticed ping is selling several versions of this battery.

What is the main difference between the 10Ah, 12Ah, 16Ah and 20Ah 36V batteries as far as applications for the e-zip bike go?

Now that I've read up a little more carefully about over-volting E-zip Trails bikes, I'd be cautious about using ping batteries to do so.

Too much current draw.

Where Ping recommends operating a 36V 12ah battery at a current discharge of 12 amps, with occasional spikes to 24 amps, that Ezip will want to draw more like 30 amps, with spikes up in the 40s.

The ping pack has over-current protection that kicks in somewhere around 25-30 amps.
You'll be tripping that battery during no pedal starts and going up hills on a regular basis and worse, the ping battery might be worked too hard on a day to day basis to live a long life to see 1000+ cycles.
Although a ping 36V 20ah battery would be better, still you'd be operating it beyond its rated discharge rate of 20 amps anytime you dig deep into the throttle.

Sorry I brought up Ping, probably not the ideal choice in your particular application.

Those falconev batteries look like they could handle the current, but the math seems to indicate, using a 36V 10ah, you'd only get about 10-15 minutes of distance, no pedaling, heavy throttle. A 36V 20ah should double that.

Now that I've read up a little more carefully about over-volting E-zip Trails bikes, I'd be cautious about using ping batteries to do so.

Too much current draw.

Where Ping recommends operating a 36V 12ah battery at a current discharge of 12 amps, with occasional spikes to 24 amps, that Ezip will want to draw more like 30 amps, with spikes up in the 40s.

The ping pack has over-current protection that kicks in somewhere around 25-30 amps.
You'll be tripping that battery during no pedal starts and going up hills on a regular basis and worse, the ping battery might be worked too hard on a day to day basis to live a long life to see 1000+ cycles.
Although a ping 36V 20ah battery would be better, still you'd be operating it beyond its rated discharge rate of 20 amps anytime you dig deep into the throttle.

Sorry I brought up Ping, probably not the ideal choice in your particular application.

Those falconev batteries look like they could handle the current, but the math seems to indicate, using a 36V 10ah, you'd only get about 10-15 minutes of distance, no pedaling, heavy throttle. A 36V 20ah should double that.

Never had this problem with either Ping or another Chinese battery. Ezip trail at most will draw 20amp. I've never seen it go beyond that as Ezip motor isn't that strong. My current setup draws 30-35amps and no problem at that level either.

Currie motor is 450 watt, at 36 v it shall not need more than 12.5 amp, at 24volt no more than 18.75, isn't?

Never had this problem with either Ping or another Chinese battery. Ezip trail at most will draw 20amp. I've never seen it go beyond that as Ezip motor isn't that strong. My current setup draws 30-35amps and no problem at that level either.


Not from firsthand experience, but this user saw these results:


Bike 2008 Ezip trailz mountain bike
36v 10ah lifePO4 battery pack

Tested twice over two days in hot weather to get a base line and averages
Day 1 94 degrees, Day 2 92 degrees
Total distance 12.98 miles
No peddling at all not even on starts
Started with fully charged cells, measured at 42v
Stopped 17 times for lights, stop signs
Tested on a 4 mile loop that is 50% down hill and 50% uphill
2 miles down, then 2 miles up, hill is mild nothing major
Speed down hill avg. 27 - 29 MPH
Speed uphill avg. 23 - 25MPH
Average amps 34, max amps 42

Quoted from this thread:
http://endless-sphere.com/forums/viewtopic.php?f=4&t=4687&st=0&sk=t&sd=a&hilit=Ezip+Trails

I hope I'm not mixing up bikes here.

You'll be tripping that battery during no pedal starts and going up hills on a regular basis and worse, the ping battery might be worked too hard on a day to day basis to live a long life to see 1000+ cycles.
Although a ping 36V 20ah battery would be better, still you'd be operating it beyond its rated discharge rate of 20 amps anytime you dig deep into the throttle.

I don't know anything about the e-zip or what it could handle, but I could tell you I've used 10ah batteries before and they DO cut out sometimes from the excessive current draw going uphill for more than a quarter mile. I feel the 15ah pack I'm using can handle everything all the better and it feels good knowing it has a very long range.


Those falconev batteries look like they could handle the current, but the math seems to indicate, using a 36V 10ah, you'd only get about 10-15 minutes of distance, no pedaling, heavy throttle. A 36V 20ah should double that.

That sounds terrible and doesn't make sense, sorry, the numbers just don't make sense. A 20ah battery should last much longer than 30 minutes even without any peddling.


Not from firsthand experience, but this user saw these results:

Bike 2008 Ezip trailz mountain bike
36v 10ah lifePO4 battery pack

Tested twice over two days in hot weather to get a base line and averages
Day 1 94 degrees, Day 2 92 degrees
Total distance 12.98 miles
No peddling at all not even on starts
Started with fully charged cells, measured at 42v
Stopped 17 times for lights, stop signs
Tested on a 4 mile loop that is 50% down hill and 50% uphill
2 miles down, then 2 miles up, hill is mild nothing major
Speed down hill avg. 27 - 29 MPH
Speed uphill avg. 23 - 25MPH
Average amps 34, max amps 42

Quoted from this thread:
http://endless-sphere.com/forums/viewtopic.php?f=4&t=4687&st=0&sk=t&sd=a&hilit=Ezip+Trails

I hope I'm not mixing up bikes here.

Are you linking the proper thread? I didn't find this block of text in there.

It's on the second page.

I was calculating using a falconEV 10ah battery, and figuring current draw 30-40 amps.

Currie motor is 450 watt, at 36 v it shall not need more than 12.5 amp, at 24volt no more than 18.75, isn't?

This is a good question. Does the Currie 450 watt motor refer to it's input or output? Since we know it's not 100% efficient the answer to that question could mean the difference between a pack that cuts out and one that doesn't.

If it means 450 watt output (which is all I would really care about) and lets grant it 85% nominal efficiency, the power input would need to be about 530 watts, or 14.7 amperes at 36 volts, 22 amperes at 24 volts.

In this case we could imagine a 36 volt 12AH BMS-controlled pack to probably cutout from time to time, a 15AH pack may not.

Right now the only LiFePo4 battery pack I'd consider would be one from Ping.

36v/12ah $319

http://www.pingbattery.com/servlet/StoreFront

Nick

I am not sure that motors classified by output, I would assume that they classified by input.

try looking at www.itselectric.ca
the batteries are pretty good there

http://www.e-bikekit.com/buybatteries.html

We have just started selling a new LiFePO4 pack we have been working on for months. A new USA "Dealer Friendly" 36v/500w kit that was made to go with the battery pack will be unveiled in the next week or so.

yes i read the review last nite looks like my next pack :)

http://endless-sphere.com/forums/viewtopic.php?f=4&t=8452

Well, they look nicer than duct tape packs.

Yeah it does look good. Too bad there are no 48V packs available yet, better yet, split in half for panniers.

I use one of the 48v packs from ItsElectric! and I have never had a problem with it. they arent that big either