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Mulcher



Member Since: 08 Aug 2016
Location: Shropshire
Posts: 240

England 2006 Range Rover Supercharged 4.2 SC V8 Zambezi Silver
Battery charging – on or off car

I'm finding conflicting opinion on whether it's OK to charge the battery with it still connected to the car.

I get the sense that the CTEK-type chargers are routinely used without disconnecting the battery, but I'm not sure about doing the same with a normal battery charger.

I have never bothered with disconnection in the past with previous vehicles but with all the electronics in the FFRR, and their propensity for going wrong, I decided it would be worth asking the question.

So, when using a normal battery charger, do I disconnect the battery or not? 2006MY 4.2 SC
BMW R1250 GSA Rallye TE
Triumph Tiger 1050 (sold)
1979 Pontiac Trans Am (sold)

Post #401381 20th Aug 2016 7:33pm
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Alistair



Member Since: 11 Feb 2011
Location: Peterborough / Bordeaux / Andorra
Posts: 7921

United Kingdom 2013 Range Rover Vogue SE SDV8 Santorini Black

I've always charged mine whilst still connected.

Of course, I may just have always been doing it wrong.....

Post #401382 20th Aug 2016 7:39pm
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Weegie



Member Since: 09 Jun 2014
Location: East Sussex
Posts: 3233

Scotland 2008 Range Rover Vogue TDV8 Stornoway Grey

If it is a "smart" charger ie. one that monitors the state of charge and adjust accordingly I would leave it connected. If not I would disconnect. John
2008 Stornoway Grey 3.6 Tdv8 Vogue
2005 TD6 Java Black Vogue - Written off!!
GAP iiD BT
2003 Discovery TD5 Auto, Nanocom Evolution - gone to a new home!
MasseyFerguson 152 - No electronics!! - Sold

Post #401383 20th Aug 2016 7:45pm
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Weejock



Member Since: 30 Dec 2011
Location: UK
Posts: 417

2002 Range Rover Vogue 4.4 V8 Epsom Green

There's no problem with leaving the battery connected and charging it. Best practice is to connect the positive lead to the battery and the negative to vehicle ground away from the battery to prevent sparking and possible ignition of hydrogen venting from the battery.
With a non-smart charger just make sure it's not left on in high current mode for a long time which can overheat the battery, that has no bearing on whether it's connected to the vehicle or not though.
CTEK chargers, if they have the option, it's best not to enter Recon modes with it connected to the vehicle. Recon mode outputs up to 16V and some electronics in the vehicle may not be happy with it.

Post #401429 21st Aug 2016 9:14am
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