Victron NG Battery terminals

Q&A and troubleshooting
,
1

I am about to install some Victron NG batteries.
The supplied terminal screws come with captive spring washer and flat washer however here is also a second loose flat washer. I am wondering about the purpose of the second washer.

The NG has aluminium battery terminals & I understand that there could be galvanic corrosion issues between a zinc plated cable lug and the aluminium terminals. Is this the reason that second washer is supplied; to go between the lug & the terminal?

This would go against the normal recommendation to place cable lug directly onto battery terminal to minimise resistance so I am conflicted.

I can’t find any victron recommendation for this. Any advice?

2

Normally there shouldn’t be a 2nd washer.
Maybe it was added by accident in the factory?

3

Depending on how thick your cable lugs are and how many cable lugs you connect to a battery terminal , you may need additional washers to secure the cable lugs, or longer screws if they no longer reach deep enough into the thread.

4

Interesting, I have three batteries & all six terminals have the extra washer.

5

I never had that.
Maybe a new employee in the factory. :grinning_face_with_smiling_eyes:

6

So, is it normal practice to place cable lug directly on the aluminium battery terminal?

7

I see now that the supplied bolts bottom out in the battery terminal holes without the second washer. They must be put in as tempory packers during assembly, so that spring washers do there job during transport.