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Will this battery be compatible?

Old 03-21-11, 11:28 PM
  #1  
Heledir
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Question Will this battery be compatible?

For Christmas my family got me a 36v direct drive front kit from https://www.ampedbikes.com/
They did not purchase a battery with it.I'm looking at the 36v/10AH Frog Style Battery pack from https://www.goldenmotor.com/. I have a few questions though.
First, is this battery is compatible with my kit
Second, is goldenmotor a reliable company? If not does anyone have another recommendation?
Thanks.

Last edited by Heledir; 03-22-11 at 04:58 PM. Reason: clarifying
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Old 03-22-11, 07:28 AM
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miro13car
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Don't be misled by flashy web sites , go to Endless Sphere forum , the most active ebike forum on the web and reasearch. Especially categories:"manufacturers to be avoiided"
Good Luck
MC
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Old 03-22-11, 09:40 AM
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This is a very important decision. Golden motors doesn't have the best quality control. Some items work fine whereas the very next one off the line could be junk.

Battery technology is rapidly changing. I wouldn't be able to recomend a battery without a better understanding of how you plan to use your bike.
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Old 03-22-11, 10:57 AM
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You're gonna want at least a 15ah batt...
The amped kit's controller, pulls from 22a to 35a and a 10ah battery, just ain't gonna cut it.
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Old 03-22-11, 12:13 PM
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miro13car
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for example,there are two posts on this forum about Magic Pie shutting down under just 30Amps overheating.
Chinese brand.
MC
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Old 03-22-11, 12:35 PM
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Sangesf
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MC,
Trust me on the GM crap...
I bought one of their minimotors for $350 in a kit, once the hall sensors on it failed it was a useless piece of crap, because it has a weird free wheel mechanism that doesn't allow sensorless control.. This was 13mos. after I bought it.
Guess what.. One month out of warranty and it breaks and of course they won't warranty it and I'm out the $$$.
I will NEVER buy another GM product EVER!

Last edited by Sangesf; 03-23-11 at 08:49 AM.
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Old 03-22-11, 04:56 PM
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I plan to use the bike to ride to and from class. I'm in college living a little ways off campus. The campus is set on the side of a hill. The bike would have to sit most of the day before being ridden home. I ruled SLA's out because of that sitting without charging, as well as the weight. The controller I have is the 22amp one. I'd like to spend less than $400 on this if possible, otherwise I have to wait.
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Old 03-22-11, 07:31 PM
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I can't with a clear consience recomend a battery for you. There is a battery chemistry that can do this for $400 but there is a real risk of fire that goes along with it. I suggest that you pour over the posts in the other forum you're asking these questions. I've worked with industrial automation equipment for 30 years and am cautious about the newer batteries. I probably will invest into it but not until I understand it completely.

Another $200 is a better entry level. Sorry
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Old 03-22-11, 08:38 PM
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There is an eBay vendor that sells a 36v 20ah battery for $389 shipped, another member on this forum bought one, search for it, and see how much luck he had with it so far.
It was sunnyday who bought that battery, ask him how the battery is holding up.. His motor/controller is a different story tho...

Last edited by Sangesf; 03-22-11 at 08:43 PM.
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Old 03-22-11, 09:04 PM
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I would PM him but I can't send them yet on here apparently. "I must have 50 posts."
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Old 03-23-11, 06:50 AM
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You're probably want to go with lifepo4 since it's safe and lightweight. Are you planning on being able to bring the bike upstairs or inside a room or will it stay outside? That's an important question because if the bike is going to stay outside, you'll want some kind of lightweight, tiny battery that you can easily take off the bike. It sounds like that is what you will want anyway because it sounds like you will want to use this to go to class and stuff.

check this out. It's expensive but this is very convenient. All you have to do is pull this battery off your bike when you go inside somewhere. Then make sure your rim has a heavy chain tying it up as well. (EDIT: if the motor and controller pulls more than about 22 amps...then this battery may not be enough..)

https://ebikes.ca/store/photos/B3609LiF-EZ_Kit.jpg

batteries are the hardest thing to put together on an e-bike. It's still in it's development. If you know how to solder or crimp and you can put a battery pack together, you can also buy 4 of these and it will work, too.
https://www.hobbyking.com/hobbyking/s...dProduct=14073

That would be $360 plus a charger and plus some kind of celllog device because you are going to need a monitor with this so you don't take it below 2.8v per cell.

Last edited by morph999; 03-23-11 at 07:15 AM.
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Old 03-23-11, 06:58 AM
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very good point , one GM product would work for years if you are lucky another in line would fail in days of use - Chinese brand factories are so unpredictable , it is hit and miss always.
On GM web site - where is any info on warranty???
Good battery pack must be warranted for more than a year.
CM
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Old 03-23-11, 07:02 AM
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main thing is, if you don't know how to use lifepo4 yet, you'll need to do about a day or two studying it before you use them otherwise you could damage the batteries and you'll be out a battery pack.

Once you get the perfect configuration of battery pack etc, you'll love it, though. You'll zip around campus very easily. When I first got mine, I was riding it everyday. It was addictive.

Last edited by morph999; 03-23-11 at 07:08 AM.
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Old 03-23-11, 07:17 AM
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Originally Posted by morph999 View Post
You're probably want to go with lifepo4 since it's safe and lightweight. Are you planning on being able to bring the bike upstairs or inside a room or will it stay outside? That's an important question because if the bike is going to stay outside, you'll want some kind of lightweight, tiny battery that you can easily take off the bike. It sounds like that is what you will want anyway because it sounds like you will want to use this to go to class and stuff.

check this out. It's expensive but this is very convenient. All you have to do is pull this battery off your bike when you go inside somewhere. Then make sure your rim has a heavy chain tying it up as well.

https://ebikes.ca/store/photos/B3609LiF-EZ_Kit.jpg

batteries are the hardest thing to put together on an e-bike. It's still in it's development. If you know how to solder or crimp and you can put a battery pack together, you can also buy 4 of these and it will work, too.
https://www.hobbyking.com/hobbyking/s...dProduct=14073

That would be $360 plus a charger and plus some kind of celllog device because you are going to need a monitor with this so you don't take it below 2.8v per cell.
The reason I suggested spending $600 is that now the OP can get the Lifepo4 pack from Grin. The HK LIPO stuff requires a level of knowlege that the average person doesn't have. It's by all means learnable but not what someone just starting out should buy.
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Old 03-23-11, 09:08 AM
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Yeah, forget Lipo.. Too much tinkering involved, UNLESS you LIKE to tinker with stuff.. But unless you have time to invest on it, it's not worth it, plus LiPo's lifespan is about 50% of LifePo4.
Your best bet is the vendor on eBay doing the 36v 20ah battery with charger and BMS included for $389 shipped in a little over a week.
I personally got my 36v 20ah batts off of eBay (VPower) but I got 'em by auction at a good price about 18mos ago (one for $170 and the other for $190 - two days apart and paid $210 shipping for the two at a combined total of $570) but 99% of the time the sellers don't do auctions starting at a dollar anymore
Both of my batts are still at 100% capacity (@ about 600 cycles) I only pull 30amps MAX, and that's on 20ah batt or 1.5C discharge rate.
The point being tho, is that you're looking at 22a to 35a Max, so a 15ah is cutting it close at 1.5C nominal and a little over 2C max, but if your careful and not a full throttle all of the time kinda guy, then you should be ok.
(eBay seller for $300 for 15ah or $20/ah)
A 20ah battery would be better, but alas a little more expensive but cheaper per ah at $389 or $19.45 per ah from that same eBay seller.
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Old 03-23-11, 09:07 PM
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I would either use the AmpedBikes battery or a ping. I would personally stay far away from Golden motors from what I have read.
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