BH Neo Cross battery connections

the attached (I hope) photograph shows the charger connection to the battery.

 

There are two rows each of 4 spring-loaded pins which contact small pads on the female half. The clip above the rows is +ve and the clip below is -ve.

 

There are voltages between the clip above and the adjacent row of pins; typically 41, 38.5, 38.5 and 0. Nothing on the lower row of pins. The voltage between adjacent pins is 2.2v or zero. Measured after charging the battery.

 

Does anyone know what these pins actually do?

You're measuring the wrong way. You need to measure again from ground, which you said was the lower clip. If any show 0v, check their continuity to ground so that you know which pins are connected to the common ground and which are not connected. The pattern of voltages would then make more sense.

You're measuring the wrong way. You need to measure again from ground ..... The pattern of voltages would then make more sense.

Starting from the top down, the voltages were

 

41.6

0.007 0.009 3.2. 3.0

0.011 0.007 10.6. 0.13

 

The voltage on the 10.6V pin decayed, over about 30 minutes after charging, to 6mV. The 3.2V and 3.0V pins also decayed by about 1.0V but no further.

 

Does that make any sense?

Your meter must be very sensitive. The outer two clips are the main connections. The row of 4 pins nearest the positive clip has nothing connected. On the lower row, only one pin is used. That's probably the one with 10.6v on it. It has a yellow wire on it that runs to the controller with the thick red and black wires to the controller. Was the battery switched on when you measured it?. Are there any power switches anywhere other than the LCD? At the moment, I can't think what that yello wire could be for.

 

Why do you need to know about this: curiosity or a problem?

The outer two clips are the main connections. The row of 4 pins nearest the positive clip has nothing connected. On the lower row, only one pin is used. That's probably the one with 10.6v on it. It has a yellow wire on it that runs to the controller with the thick red and black wires to the controller.

I'm told that the 8 pin connector is for a diagnostic device which BH dealers may have. It tests the battery in some way and has no effect on the operation of the bike.

 

i have a couple of niggles with the battery and i'm preparing for its eventual replacement.

I'm told that the 8 pin connector is for a diagnostic device which BH dealers may have.

 

Can't be true with only one wire. The yellow wire goes to the controller so the function has to be something between the controller and battery. If there were a sensor in the battery, it would have a fixed voltage on it, so more likely its something from the controller to the battery.

Can't be true with only one wire. The yellow wire goes to the controller so the function has to be something between the controller and battery.

The yellow wire is on the "bike side" not the "battery side". You have gained access to the controller by removing the cover?

 

I've now seen a photo of what is on the other side of the 8 pins inside the battery and it is 8 wires marked 1 to 8. The 36V battery ought to be 10S4P or 5P which implies 10 separate useful outputs. So we're short of 2 and many more if this kit is used on the 48V battery. But I think that part of the interface is a serial o/p which could explain why "there aren't enough wires".

 

The diagnostic kit can only be attached with the battery out of the bike.

 

This is a photo of the data display. The colour is a bit dark. It shows data for up to 13 cells.

 

Yes. That's right. I wasn't thinking straight. Two will be data tx and rx - probably the 2 with 3v. Normally, on a data port you need 4 connections. The others being ground and 5v, but you already have a ground on the clip and the battery can supply its own 5v.