Bafang BBS01B Bullet Connectors Size?

[vfr400]

The ones on it now are crimped (battery side ) no solder. But they don't fit the motor properly i've had to tape them together. I've done 300 miles so far on the motor.

You're lucky that they haven't already set fire to your bike then. We must have had about 6 cases of burnt bullet connectors in the few months.

 

[Bafangkid]

Well thanks for the heads up I've found an auto electrician who said he would solder xt60 for £20 which is what a soldering iron would cost me.

Just out of interest why do soldered ones not catch fire and crimped ones do ?

 

[MontyPAS]

The guy above said no crimping i'm totally confused now.

Crimping will be fine. All my bikes, I've used crimped Andersons.

 

[MontyPAS]

You're lucky that they haven't already set fire to your bike then. We must have had about 6 cases of burnt bullet connectors in the few months.

Thats because the crap insulation on bullets melts and causes a short. Nothing to do with soldered vs crimped!
As an electrician and later a DATA installer, I've down 1000's of crimped joints without issue!

 

[Bafangkid]

Thats because the crap insulation on bullets melts and causes a short. Nothing to do with soldered vs crimped!
As an electrician and later a DATA installer, I've down 1000's of crimped joints without issue!

Anyway gentlemen appreciate the information. I learned a bit tonight which always pleases me.

 

[Nealh]

The reason the crap insulation melts is because of poor or thin metal used in the bullets they simply can't handle heat. Good connectors use copper.

 

[vfr400]

Well thanks for the heads up I've found an auto electrician who said he would solder xt60 for £20 which is what a soldering iron would cost me.

Just out of interest why do soldered ones not catch fire and crimped ones do ?

Two reasons:

Firstly, copper corrodes in air. It doesn't need moisture, just air. It oxidises and the contact resistance goes up, then the contact area will heat up when any current flows. Tin lead solder doesn't oxidise and works as a protective coating of the copper.

Secondly, you need proper equipment to get a proper crimped joint. it's not something you can do with those cheapo crimp tools. the crimp needs to be sufficient to exclude air from the joint, bearing in mind that it's stranded wire and there are gaps between the strands.

DIY crimping is OK for low current connectors, like throttle. LCD, PAS, etc, but not for anything that transmits high current, like batteries or motors.