Which battery charger - dual batteries

I find it strange that my MY14 Owners Handbook states on P207 that when connecting jump leads, connect the positive to the battery and the negative to a suitable earth point at least 0.5m from the battery (not the negative terminal as we all should know), but the very next section regarding 'connecting a starting aid' (starting aid or slave battery) it states connect the positive to the positive battery terminal and the negative to the ground terminal (negative terminal) of the battery?
Is this a typo or am I reading it incorrectly?
Mind you on P208 it also states to disconnect and remove the battery from the vehicle for charging purposes?


The Ctek MXS10 looks the goods, with an Ingress Protection rating of IP65 and supplied standard with the permanent connection lead.

What is the reason for not using the negative post. I understand it is to avoid a spark near volatile gases, is this correct?

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Originally Posted by AndyG

What is the reason for not using the negative post. I understand it is to avoid a spark near volatile gases, is this correct?

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YES

The same reason for connecting the positive first and disconnecting the negative first - to keep sparks away from the battery area.

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Originally Posted by AndyG

What is the reason for not using the negative post. I understand it is to avoid a spark near volatile gases, is this correct?

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Apart from volatile gases, battery and fuel brake lines, does it also have something to do with the damage to the Battery Monitoring System which is inline with the negative post connection?


An extract from a Topix service message - 'When charging a battery (both primary and secondary) with a BMS (battery monitoring system) fitted, the earth from the charger must be connected to a suitable chassis or engine earth (check Topix for appropriate location). This allows the BMS to see the current going into the battery. However when using a diagnostic charger from Midtronics such as GR1, GRX GR8(110 volts)this connection process can cause an incorrect battery analysis due to the extra resistance in the wiring when connected to a chassis or engine earth.

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Originally Posted by Mungus

Apart from volatile gases, battery and fuel brake lines, does it also have something to do with the damage to the Battery Monitoring System which is inline with the negative post connection? An extract from a Topix service message - 'When charging a battery (both primary and secondary) with a BMS (battery monitoring system) fitted, the earth from the charger must be connected to a suitable chassis or engine earth (check Topix for appropriate location). This allows the BMS to see the current going into the battery. However when using a diagnostic charger from Midtronics such as GR1, GRX GR8(110 volts)this connection process can cause an incorrect battery analysis due to the extra resistance in the wiring when connected to a chassis or engine earth.

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I also recall reading something like this here before...the BMS can have a fit due to some electrickery thing...

Thanks guys. Repo have the 5amp ctek charger for $99 in their catalogue at the moment so I'll see if I can get one of those.

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Originally Posted by drivesafe

YES

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So, having a Traxide setup, is it best to charge the main battery via a white plug adapter, and while doing so, disconnect the 2nd battery (in my case a yellow top); then charge the yellow top with still isolated?

Cheers

I leave mine connected,no issue at all,but this is for top up.

If they were both flat,i would do one then the other as the charger probably would not have the capacity to do the two at once.

I have a Traxide DBS and charge the aux battery through the Anderson plug at the rear. Allows me th charge and still lock the vehicle.
As long as the batteries aren't isolated, both batteries are being charged together, as I understand things.
Same thing I reckon if you charge the main battery, if not isolated from aux then both will charge.