Mounting a battery to frame

[Laissez]

Any tips what to do with that bottom hole and how to secure it to frame also? Not sure if those 2 at top are enough.

 

[99t4]

Can't really tell from your photo what you mean by "that bottom hole." But if you are wanting another water bottle holder type threaded mounting point, drill a hole and install a 5mm rivet nut. Lots of "how to install rivet nut on bicycle frame" on the internet.

Agree that three would be better than two.

 

[markz]

Get something like this to clamp (web links below pic) around the frame and figure out how to affix a zip tie from Bottle Cage Adapter Mount to battery. You wont be able to use the cage bosses on the bike itself because of the height differences.

Question is if or when it will break.
I would do something similar but with some T-bolt clamps
Drill a hole in it to put flattened bolt so the bolts head sits flush with the frame with the threads pointing up. Then figure out a way to affix the battery plate to it, if theres more mounting holes in the battery plate or what have you.







https://www.amazon.com/Gub-Bicycle-Adapter-Adjustable-Handlebar/dp/B07BVDYB74/ref=sr_1_5?dchild=1&keywords=bike+bottle+cage+clamp&qid=1608281769&sr=8-5

https://www.amazon.com/Mczxon-Aluminium-Adjustable-Universal-Handlebar/dp/B08JH622ZN/ref=sr_1_22?dchild=1&keywords=bike+bottle+cage+clamp&qid=1608281922&sr=8-22

 

[Laissez]

Can't really tell from your photo what you mean by "that bottom hole." But if you are wanting another water bottle holder type threaded mounting point, drill a hole and install a 5mm rivet nut. Lots of "how to install rivet nut on bicycle frame" on the internet.

Agree that three would be better than two.

Meant this one highlighted with red circle.

Get something like this to clamp (web links below pic) around the frame and figure out how to affix a zip tie from Bottle Cage Adapter Mount to battery. You wont be able to use the cage bosses on the bike itself because of the height differences.

Question is if or when it will break.
I would do something similar but with some T-bolt clamps
Drill a hole in it to put flattened bolt so the bolts head sits flush with the frame with the threads pointing up. Then figure out a way to affix the battery plate to it, if theres more mounting holes in the battery plate or what have you.

Thanks for your ideas. Only problem is that down tube diameter is 5.1 cm.

I found something interesting myself, I might try these 3d print ones once library opens again and can use their printer.
https://www.thingiverse.com/thing:3686417
https://www.thingiverse.com/thing:4619606

 

[markz]

Thingiverse links looks to fancy to me.
Those T-bolt clamps I posted come in a lot of different sizes from a clamps 0.75" to 8" in what seems to be 0.5" steps.
In Canada, the only place I've seen them for sale is Princess Auto which is like America's Harbor Freight. Its basically the same thing, except I would probably spin a nut or two on to raise the battery up a bit, and you can match whatever height you need. Pro tip, you can also use some cut up rubber dinner mats from your local shittty dollar store to save your paint job on the bike, pro tip #2 also slap some on the resting point of the battery base. If you want thicker, find some child play mats/work floor mats. What I'd then do is find some metal, like a traffic sign (free if discarded and laying on ground, recycling bro recycling :wink: ) bolt that down, double up if necessary then mount battery base to that because you then can drill holes where ever you want, or just slide more t-bolt claps to where they're needed.

Thanks for your ideas. Only problem is that down tube diameter is 5.1 cm.
I found something interesting myself, I might try these 3d print ones once library opens again and can use their printer.
https://www.thingiverse.com/thing:3686417
https://www.thingiverse.com/thing:4619606

 

[Laissez]

Thingiverse links looks to fancy to me.
Those T-bolt clamps I posted come in a lot of different sizes from a clamps 0.75" to 8" in what seems to be 0.5" steps.
In Canada, the only place I've seen them for sale is Princess Auto which is like America's Harbor Freight. Its basically the same thing, except I would probably spin a nut or two on to raise the battery up a bit, and you can match whatever height you need. Pro tip, you can also use some cut up rubber dinner mats from your local shittty dollar store to save your paint job on the bike, pro tip #2 also slap some on the resting point of the battery base. If you want thicker, find some child play mats/work floor mats. What I'd then do is find some metal, like a traffic sign (free if discarded and laying on ground, recycling bro recycling :wink: ) bolt that down, double up if necessary then mount battery base to that because you then can drill holes where ever you want, or just slide more t-bolt claps to where they're needed.

I live actually in Finland, and now after I thought trough your idea it sound a pretty good one. Some sort of hose clamp could work.
https://www.biltema.fi/en-fi/car---mc/car-spares/cooling-systems/hose-clips/hose-clamp-2000030785
https://www.biltema.fi/en-fi/car---mc/car-spares/cooling-systems/hose-clips/

So your idea is basically like this if I understood it correctly?

Edit: Actually found out there are product which does have this build in some sort of pipe support not sure what they are called in English: https://www.k-rauta.fi/tuote/viemarikannake-prof-1-12-47-51mm-eristamaton/6405422896172

 

[markz]

Bolt goes the other way. The clamp is holding the flat head bolt upside down resting the head of the bolt on the frame of the bicycle. The flat head bolts come in lots of flavors, see picture below in what I mean by flat head, see how the head of the bolt is flat.

So your idea is basically like this if I understood it correctly?

 

[Laissez]

Bolt goes the other way. The clamp is holding the bolt upside down resting the head of the bolt on the frame of the bicycle.

Ah, noh I get it. And actually found a product which has this build in some sort of pipe support:

https://www.taloosi.fi/putkikannake-fischer-fgrs-45-50-mm-m8-eristetty
https://www.k-rauta.fi/tuote/viemarikannake-prof-1-12-47-51mm-eristamaton/6405422896172

 

[miro13car]

munting battery to the ebike frame ?
you would have to use a lot of duck tape wriping around frame and battery, no worries about brackets and screws.
duck tape is cheap and nice silver colour.

 

[99t4]

From your photo it appears that two of the bottle cage bosses already match up? I would simply add the third by installing a rivnut there as mentioned above. Clean and elegant.

 

[richj8990]

Can't really tell from your photo what you mean by "that bottom hole." But if you are wanting another water bottle holder type threaded mounting point, drill a hole and install a 5mm rivet nut. Lots of "how to install rivet nut on bicycle frame" on the internet.

Agree that three would be better than two.

I know exactly what he means, I've had to drill that bottom hole twice on two different holders (the black part he was pointing at in the picture). I have no idea why they don't put a hole there to begin with. Then you slide the aluminum bracket down there to fit your water bottle hole. A lot of frames have the lower water bottle hole on the downtube waaaaaay down near the bottom bracket. You can't fit the battery holder all the way down there with the holes it has, so you drill a new 3rd hole at the bottom and then you can move the holder up a bit so everything will fit in the bike's triangle.

Or, you can do what I will do in the future when this battery dies: you buy a new battery that has a triangular casing and straps for the top tube and seat tube. So you strap it on instead of solid mounting it on flimsy bottle holder screws. Much better design for offroading.

 

[offGridDownUnder]

Any tips what to do with that bottom hole and how to secure it to frame also?

I use the two holes to align and mount the battery cradle to the frame. The plastic claws that hold the battery to the cradle are too weak and can't be fixed if they break. I wrap velcro straps about the battery and frame to hold the mass of the battery.

The torsion load on the unsupported bolts into a round tube which drops away on both sides is too great to rely on. Yes, it will hold. For a while. And when it fails, it costs you.

Just strap the battery onto the frame to take the loads.

 

[docw009]

I am half heartedly mounting a 9.2 pound battery upside down on a step-thru bike. The battery cradle is like the ones in the above picture. Only half of the plastic cradle teeth actually grips the battery. I am sure it will tear off with time, so I have velcro straps on order. A giant steel hose clamp around the rear of the battery might be better, These batteries were intended to go rightside up, with the weight pressing down on the rear.

It also looks awful, I did mount the cradle to a metal bracket, drilling two extra holes in the rear, The bracket is securely attached to the frame with four points.

 

[richj8990]

I am half heartedly mounting a 9.2 pound battery upside down on a step-thru bike. The battery cradle is like the ones in the above picture. Only half of the plastic cradle teeth actually grips the battery. I am sure it will tear off with time, so I have velcro straps on order. A giant steel hose clamp around the rear of the battery might be better, These batteries were intended to go rightside up, with the weight pressing down on the rear.

It also looks awful, I did mount the cradle to a metal bracket, drilling two extra holes in the rear, The bracket is securely attached to the frame with four points.

I forgot to mention earlier if this helps you psychologically lol: of the three frames I've mounted Hailong II batteries on, two have needed to be upside down for the holder and battery to fit. And none of them came off. They got a little loose but they were fine. I'm careful on chunky areas offroad, a lot more careful than certain other maniacs, but an upside down battery is not bad, remember the battery should be locked in so it's pretty much the same either way. If it's locked it's not going to slip down. Only potential issue is lateral movement and that could happen with the holder in either position.