Battery bag for top tube

General Discussion about electric bicycles.
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YonathanZ   10 mW

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Battery bag for top tube

Post by YonathanZ » Dec 25 2014 6:46am

Hi,

I bought my ebike two months ago. The battery is stored in a saddle bag, and the battery tore through the bag slightly, so it's only a matter of time before it just falls through (probably mid-drive).
Since the motor is in the rear wheel, I want to place the battery on the top tube near the front wheel (it's a folding, 20" wheel frame, like a Tern or a Dahon), for balance. Also, I'm tired of carrying the entire seatpost+saddle+battery whenever I lock the bike. It's just too big and bulky, and looks ridiculous.

So I need a bag for the front tube that's large enough for a battery that is 22x12x8.5 cm. I couldn't find anything that big, unfortunately... Eventually, I'd like it to look kinda like the way BionX batteries are mounted on the top tube. (see here: http://tinyurl.com/nsk2nw6)

Let me know if you find such a bag/battery box.

Thanks!

cwah   10 GW

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Re: Battery bag for top tube

Post by cwah » Dec 25 2014 7:49am

Normal bottle battery should fit isn't it?
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lester12483   10 kW

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Re: Battery bag for top tube

Post by lester12483 » Dec 25 2014 10:32am

Try something like this to hold the battery. Works great..
Attachments
Lithium Battery Charging.jpg
Lithium Battery Charging.jpg (37.53 KiB) Viewed 3825 times
MT6 Hybrid- Electric Bicycle 48V
48V 23AH AllCell Lithium Manganese Battery Pack
http://www.chicagoelectricbicycles.com

YonathanZ   10 mW

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Re: Battery bag for top tube

Post by YonathanZ » Dec 25 2014 12:14pm

cwah wrote:Normal bottle battery should fit isn't it?
I already have a battery, I only need a case. Does anyone sell a bottle battery case? And if yes, how do I connect it to the battery (these batteries seem to have their own connectors built in).?

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biohazardman   100 kW

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Re: Battery bag for top tube

Post by biohazardman » Dec 25 2014 10:05pm

Bags can wear quick and don't protect your batteries well. If you can find some kind of plastic box or make your own with a heat gun and some ABS sheet you can secure the box to your bike instead of the bag. Just slot the box on the bottom and use straps or clamps to secure it. The bag will no longer have to take the abuse and just be for looks on the outside of the box. You can google bottle batts and wade through the information if you would prefer.
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YonathanZ   10 mW

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How to mount battery to 20 inch folding bike?

Post by YonathanZ » Dec 26 2014 3:13pm

Hi,

I have a 20" folding ebike. Originally, the battery was in a bag attached to the seatpost, but I'd like to attach it to the top tube of the bike but don't know how.
The battery is 10.5x21x7 cm. I still have the bag it came in, in which it fits almost perfectly, but if I attach it with 2 velcros and one buckle than it's a hassle to remove it whenever I lock the bike. Is there a more elegant solution out there?

Here's the bike as it was originally (with the battery bag attached to the seatpost):
Image

I'd love to hear some suggestions. I wish there was a BionX-battery look-alike cover + mount to buy. I love the way the battery is mounted on this Dahon Formula ebike:
Image

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Re: How to mount battery to 20 inch folding bike?

Post by amberwolf » Dec 27 2014 3:21am

YOu might check out the "show us your homemade battery housing" thread, and the "your creation's before and after pics" thread, for a "few" ideas. :)

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Re: How to mount battery to 20 inch folding bike?

Post by YonathanZ » Dec 27 2014 8:17am

amberwolf wrote:YOu might check out the "show us your homemade battery housing" thread, and the "your creation's before and after pics" thread, for a "few" ideas. :)
I did, but no one uses a 20 inch bike. Not to mention mine doesn't have a triangle frame, so I can only use the top tube. I have a bag for the battery, I just need to secure it to the frame in a way that allows removing it when I lock the bike.

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Ykick   100 GW

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Re: How to mount battery to 20 inch folding bike?

Post by Ykick » Dec 27 2014 8:34am

How my folder carries battery packs of late:
IMG_3737.JPG
IMG_3737.JPG (88.32 KiB) Viewed 3960 times
These are HK RC Lipo hardcase but the "saddlebag" principle may work with other shapes/sizes. My feet clear while pedaling and it's easy to remove when I wanna take the pack with me.

If that's your bike in the top photo, maybe try hanging it below the top tube?
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Re: How to mount battery to 20 inch folding bike?

Post by melodious » Dec 27 2014 8:56am

I'm currently using a bottle mount type battery on the main tube section on a similar style folder using the Mbolts and some spacers. Almost, the same position as the Dahon you pictured.
Image

My folder has an head tube attachment for front accessories (baskets, bags, etc.). I modified it to accept a Brompton attachment plate for their accessories. The Brompton plate is a very hard plastic resin and is one of the best front bag solutions I've seen. I had to re drill the mounting holes, and shave some material to make it fit, then applied JBweld bonding the head tube to the plate. I can carry groceries (talking heavy milk & meat stuff) in the front, no worries. I put a ~15 lbs 36v 20Ah battery in that bag too.

Another solution could be a tube pannier setup. Don't use large panniers, they may produce leg strike. The small or medium variety should do. Probably can't use your current battery in this bag. But folks are able to make their own RC packs work with them. :idea:
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Re: How to mount battery to 20 inch folding bike?

Post by YonathanZ » Dec 27 2014 9:59am

There's no place to mount a bottle on my bike, and I don't have a bottle battery anyway. I just bought my bike 2 months ago so I'm stuck with this battery for the time being. Pannier bags don't help either.
Melodious, how long is the space between the screen for that bottle battery mount? And how big is that bottle? Can I fit a 36v 10ah battery in it?

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Re: How to mount battery to 20 inch folding bike?

Post by melodious » Dec 27 2014 10:30am

I have standard bottle mounting attachments on the top of the frame. Nothing special, but my bike has them, where yours doesn't. Surprised it doesn't, as its a common area to put them. Your battery probably has no mount to attach to besides the seatpost bag. And these bottle mount batteries come in various configurations: 36v 10-16Ah & 48v 8-12ishAh.

I'd live with your current setup. Eventually, you'll think of something to make battery removal easier.
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Re: How to mount battery to 20 inch folding bike?

Post by wineboyrider » Dec 27 2014 10:56am

YonathanZ wrote:There's no place to mount a bottle on my bike, and I don't have a bottle battery anyway. I just bought my bike 2 months ago so I'm stuck with this battery for the time being. Pannier bags don't help either.
Melodious, how long is the space between the screen for that bottle battery mount? And how big is that bottle? Can I fit a 36v 10ah battery in it?
You can drill and tap your own water bottle mounts?
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Ykick   100 GW

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Re: How to mount battery to 20 inch folding bike?

Post by Ykick » Dec 27 2014 11:25am

wineboyrider wrote:
YonathanZ wrote:There's no place to mount a bottle on my bike, and I don't have a bottle battery anyway. I just bought my bike 2 months ago so I'm stuck with this battery for the time being. Pannier bags don't help either.
Melodious, how long is the space between the screen for that bottle battery mount? And how big is that bottle? Can I fit a 36v 10ah battery in it?
You can drill and tap your own water bottle mounts?
Drill yes, tap no. Use Rivnut inserts: http://www.rivnut.com I buy 'em on eBay.

Don't need the tool either unless you're planning to do large quantities - this video shows how to swag your own:

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YonathanZ   10 mW

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Re: How to mount battery to 20 inch folding bike?

Post by YonathanZ » Dec 27 2014 2:22pm

melodious wrote:I have standard bottle mounting attachments on the top of the frame. Nothing special, but my bike has them, where yours doesn't. Surprised it doesn't, as its a common area to put them. Your battery probably has no mount to attach to besides the seatpost bag. And these bottle mount batteries come in various configurations: 36v 10-16Ah & 48v 8-12ishAh.

I'd live with your current setup. Eventually, you'll think of something to make battery removal easier.
I am asking about the spacing between the screws because, apparently, there are two holes under the top tube of my bike. Right now, there are cable holders attached to those holes, but maybe I can attach a battery mount there. Then again, I don't have a bottle battery...

What I have is a saddle/seatpost bag, and I'm going to try to attach it to the top tube using three velcros, just like this bag attached to the top tube:
Image

Edit: Nevermind, the holes in my frame are 3" apart. Apparently, bottle mount holes are 2.5" apart. Anyway, do you think 3 velcros can hold a 2.3KG battery tight enough?

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Re: How to mount battery to 20 inch folding bike?

Post by cjh » Dec 27 2014 5:07pm

Add a couple of Rivnuts/Nutserts in the top of the tube and add a bottle battery. That velcro looks fine for hanging underneath but not on top.
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tern.jpg
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Re: How to mount battery to 20 inch folding bike?

Post by cjh » Dec 27 2014 5:12pm

You could also just put a small rack on the back and put your battery on that.

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Re: How to mount battery to 20 inch folding bike?

Post by cwah » Dec 27 2014 7:20pm

Ykick wrote:
wineboyrider wrote:
YonathanZ wrote:There's no place to mount a bottle on my bike, and I don't have a bottle battery anyway. I just bought my bike 2 months ago so I'm stuck with this battery for the time being. Pannier bags don't help either.
Melodious, how long is the space between the screen for that bottle battery mount? And how big is that bottle? Can I fit a 36v 10ah battery in it?
You can drill and tap your own water bottle mounts?
Drill yes, tap no. Use Rivnut inserts: http://www.rivnut.com I buy 'em on eBay.

Don't need the tool either unless you're planning to do large quantities - this video shows how to swag your own:

are you advising him to drill his bike frame?
Help me find my stolen electric brompton: http://bit.ly/1a0vbBC and Bosch Sinus B3 http://bit.ly/1eV0WQz

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Re: How to mount battery to 20 inch folding bike?

Post by cjh » Dec 27 2014 7:44pm

cwah wrote:
are you advising him to drill his bike frame?
Why not? I just did it yesterday for a bottle battery install where the existing mounts were too close to the seat tube to allow for the battery to fit on those mounts. It's no big deal really, but I suppose if you have a really expensive frame and are going to remove everything if you want sell it down the track without the motor, etc. it might be a concern. I'd just put a couple of cap screws in the holes and call it good.

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Re: How to mount battery to 20 inch folding bike?

Post by YonathanZ » Dec 31 2014 1:23pm

Drilling into a $1500, two months old bike? No way.
I did go to a shoemaker who stitched two wide velcros to the bag I had, and they hold the bag attached to the bike just fine, even at speeds over 35kmph. I really like how it turned out, both technically (the bike is more balanced now, and I can remove the battery and put it in the bag instead of having to carry 45cm seatpost + saddle + battery and look funny) AND visually (it looks really nice, the color of the bag makes it blend in with the bike frame - it looks like its meant to be there).

Here's a photo I just took:

Image

Thanks to all who replied and offered suggestions. :)

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