Hailong 03 down tube battery - how to attach it appropriately?

[Laissez]

Hi,

I'll just ask everyone: how did you attach your HaiLong 03 down tube battery to the frame? The battery is quite heavy at 6.6 kg. Images etc. are appreciated. Thinking how to mount the battery to my new project.

[Mclewis1]

I saw from your posting on another forum that the Wolf Tooth components B-RAD mounting products were mentioned. To me those and the Grin Technologies BOB products are the best quality options for mounting heavy downtube batteries (but there are a few other simpler options). One characteristic of your frame that negates one of the really effective benefits of the Grin BOB products is the shape of your downtube. Not being a round tube the "outriggers" on the BOB mounts don't look like they'll come into play (but I might still try them, it will depend on how deep the sides or outriggers are and whether or not they will contact the downtube). This will put more side to side twisting force on the mounting points on the frame.

If I was mounting a big downtube battery on your style frame I'd want to use more than just two threaded frame mounting points. So I might consider adding a wrap around type of mounting for the stand off mounting points which I think are very beneficial on their own as they provide a flat and long/wide mounting surface for the bottom of the battery. Given that bottom piece is structurally plastic (with a thin steel reinforcement to keep the bolts from digging in) I think anything that spreads out the load and keeps it more stable is also beneficial.

https://www.wolftoothcomponents.com/col ... rad-system
https://ebikes.ca/shop/electric-bicycle ... ories.html

[Laissez]

I saw from your posting on another forum that the Wolf Tooth components B-RAD mounting products were mentioned. To me those and the Grin Technologies BOB products are the best quality options for mounting heavy downtube batteries (but there are a few other simpler options). One characteristic of your frame that negates one of the really effective benefits of the Grin BOB products is the shape of your downtube. Not being a round tube the "outriggers" on the BOB mounts don't look like they'll come into play (but I might still try them, it will depend on how deep the sides or outriggers are and whether or not they will contact the downtube). This will put more side to side twisting force on the mounting points on the frame.

If I was mounting a big downtube battery on your style frame I'd want to use more than just two threaded frame mounting points. So I might consider adding a wrap around type of mounting for the stand off mounting points which I think are very beneficial on their own as they provide a flat and long/wide mounting surface for the bottom of the battery. Given that bottom piece is structurally plastic (with a thin steel reinforcement to keep the bolts from digging in) I think anything that spreads out the load and keeps it more stable is also beneficial.

https://www.wolftoothcomponents.com/col ... rad-system
https://ebikes.ca/shop/electric-bicycle ... ories.html

Yes, I know about the bottle bobs, but the problem with those are shipping cost which is almost 50 dollars to Europe otherwise I would try them but +70 dollars is just too much. Also on my previous bike I had solution like wolftooth only problem with that it elevates battery quite high and it's not that good solution to bumpy offroads.

Some rubber padding/spacers between the mounting solution and frame could add some stability.

[Laissez]

I saw from your posting on another forum that the Wolf Tooth components B-RAD mounting products were mentioned. To me those and the Grin Technologies BOB products are the best quality options for mounting heavy downtube batteries (but there are a few other simpler options). One characteristic of your frame that negates one of the really effective benefits of the Grin BOB products is the shape of your downtube. Not being a round tube the "outriggers" on the BOB mounts don't look like they'll come into play (but I might still try them, it will depend on how deep the sides or outriggers are and whether or not they will contact the downtube). This will put more side to side twisting force on the mounting points on the frame.

If I was mounting a big downtube battery on your style frame I'd want to use more than just two threaded frame mounting points. So I might consider adding a wrap around type of mounting for the stand off mounting points which I think are very beneficial on their own as they provide a flat and long/wide mounting surface for the bottom of the battery. Given that bottom piece is structurally plastic (with a thin steel reinforcement to keep the bolts from digging in) I think anything that spreads out the load and keeps it more stable is also beneficial.

https://www.wolftoothcomponents.com/col ... rad-system
https://ebikes.ca/shop/electric-bicycle ... ories.html

Yes, I know about the bottle bobs, but the problem with those are shipping cost which is almost 50 dollars to Europe otherwise I would try them but +70 dollars is just too much. Also on my previous bike I had solution like wolftooth(https://www.aliexpress.com/item/4000453357310.html) only problem with that it elevates battery quite high and it's not that good solution to bumpy offroads and this is going to be my offroad bike with middrive.

Some rubber padding/spacers between the mounting solution and frame could add some stability.



Actually just found out that they do sell these bottle bobs, double bobs etc. on europe:
https://www.ebike-solutions.com/en/deta ... ticle/1098

Price is still a bit steep with shipping 44€ which makes it 54 usd.

[99t4]

Add a few more rivet nuts (sometimes called "rivnuts") to the DT. Four should anchor it better than two, no? 5mm is standard but you could easily install 6mm.

If you feel you lack the skills (check YT for adding rivnuts to bicycle frame) most good bicycle shops do this routinely, no big deal.

[ilu]

You could also use these if the tube diameter is max 5cm. But rivnuts might be better option, and cheaper unless you need to pay for the work.

In addition, for offroad I recommend using straps, I have these. Even with the base fixed with three bolts on a flat-top down tube, the plastic bends a bit and the battery wobbles sideways, but the straps make it solid. Taking the battery off is slightly more complicated though.

[powrtrip]

installed threaded nuts to frame in 3 places... ground down the other ones flat.... https://www.harborfreight.com/45-piece- ... -1210.html

[Laissez]

I would like to have a bit more side support with the battery. Any tips to make my Hailong mounting a bit sturdier? Now It's bolted to both bottle bob holes and with zip ties. It's a bit wobbly at the bottom and I would like to stop that.

[SlowCo]

Use more mounting holes by using threaded rivets and use glue/sealant to support the holder better. See this video at 5:38 and from 13:13:

[99t4]

That one mounting screw I can see in your photo looks like it is deforming the plastic. A fender washer (wider washer with small hole) under the screw head might help spread the load and help stabelize.

[Laissez]

Use more mounting holes by using threaded rivets and use glue/sealant to support the holder better. See this video at 5:38 and from 13:13:

I don't want to drill additional holes to frame.

That one mounting screw I can see in your photo looks like it is deforming the plastic. A fender washer (wider washer with small hole) under the screw head might help spread the load and help stabelize.

Thanks for idea, I'll go to buy wider washers.