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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red
Battery Voltage - charging - CTEK

I am just wondering about battery voltage. I fitted the car with the CTEK connector with indicator attached to the jump start terminals under the bonnet. When I check this it is often red.

Red: means the battery charge is below 12.4 V. It’s definitely time to charge the battery.
Yellow: means the battery charge is between 12.4 and 12.65 V. It’s time to start thinking about charging the battery.
Green: means the battery charge is more than 12.65 V. OK! No need for charging.

Today I did check with a multimeter. The indicator correct, I need to charge.

Have a MXS 5.0 TEST&CHARGE which I leave on overnight. Last weekend I also did this and the end result was the same.

2 Questions:
1. Can the points under the bonnet be used for charging? I am sure they are but want to be 100% sure.
2. Is the MXS 5 not enough and do I need to get MXS 10? SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #610829 28th Oct 2021 6:00pm
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recordman



Member Since: 08 May 2013
Location: Kent
Posts: 59

United Kingdom 2017 Range Rover Autobiography SDV8 Aruba

I use an MXS 5.0 on the underbonnet terminals and it works perfectly. 2017 SDV8 Autobiography

Post #610834 28th Oct 2021 6:36pm
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pld118



Member Since: 25 Mar 2013
Location: Bairns
Posts: 3974

Scotland 2014 Range Rover Vogue SDV6 Santorini Black

What he said 👆🏻

Post #610835 28th Oct 2021 6:40pm
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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red

Thank you for that. I have it on charge overnight and during the day tomorrow. I will check the voltage in the morning and see where it stands. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #610836 28th Oct 2021 6:51pm
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RRV8SC



Member Since: 02 Oct 2021
Location: SW London
Posts: 60

United Kingdom 2015 Range Rover Autobiography 5.0 SC V8 Santorini Black

recordman wrote:
I use an MXS 5.0 on the underbonnet terminals and it works perfectly.


Yes, me too, no problem

Post #610847 28th Oct 2021 7:49pm
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knwatkins



Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 427

United Kingdom 2014 Range Rover Vogue SE SDV8 Corris Grey

Same here concerning the MXS 5.0 and the under bonnet posts. I sometimes find I need to leave the car on charge for a couple of days before it reaches the fully charged state. Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Post #610858 28th Oct 2021 8:25pm
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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red

OK.. Voltage after 11 hours is 12.34V - charger connected and running. I don't need to drive the car until tomorrow so I will leave on charge. I am wondering if my charger has a issue, I will ask my friends to see if I can borrow another one. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #610885 29th Oct 2021 5:03am
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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red

So when I connected the multimeter just now it is still reading 12.34V. The charger said in was in the Float stage and in the manual it says 13.6V. So I think my charger has the issue. If anyone has a multimeter I would be interested in their voltage reading on the terminals. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #610938 29th Oct 2021 1:42pm
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knwatkins



Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 427

United Kingdom 2014 Range Rover Vogue SE SDV8 Corris Grey

I have a little BM2 battery monitor across my primary battery that constantly logs my battery voltage and uploads the results to my phone whenever I walk near the car.

On the 19th October, I had my MXS 5.0 connected from about 8:00, as you can see from the below.

Click image to enlarge


You can see that between 08:00 to 14:00 the charging algorithm ramps up the voltage to around 14.5V. After 14:00, it drops down to around 13.6V and this voltage is maintained.

Here's the log from today, as you can see my battery voltage at rest, without a charger connected is about 12.6V.

Click image to enlarge


I agree with you. Your charger looks like it isn't operating correctly. Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Post #610941 29th Oct 2021 2:38pm
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nicedayforit



Member Since: 11 Jun 2011
Location: Beside the Solway
Posts: 3739

England 2004 Range Rover Vogue Td6 Giverny Green

I had an MXS 5 fail after many years of use. It would only display battery voltage and showed no signs of charging. Bought a couple of ALDI chargers, never had any problems to date. Thumbs Up

Post #610944 29th Oct 2021 3:02pm
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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red

Thank you for that. I will see if I can borrow one. Then I will look for a new one. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #610964 29th Oct 2021 4:10pm
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ur20v



Member Since: 19 Feb 2019
Location: None
Posts: 625

A Trap 

sounds normal to me for normal battery (non-AGM)

Post #610979 29th Oct 2021 6:09pm
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Kot



Member Since: 10 Mar 2021
Location: InThePub
Posts: 291

United Kingdom 

I agree with ur20v
Read the manual page 5

https://www.ctek.com/storage/6522FAFFDFC65...-UK-EN.pdf 2018 SE SDV8 4.4 Byron Blue

Post #610980 29th Oct 2021 6:17pm
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luxmoggy



Member Since: 19 Jun 2020
Location: Trier
Posts: 176

Germany 2018 Range Rover Autobiography SDV8 Montalcino Red

New charger I can see the voltage climbing on the multimeter… SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

Post #611392 2nd Nov 2021 3:25pm
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Aldogt3



Member Since: 04 Mar 2018
Location: Zagreb
Posts: 15

Croatia 

You should measure battery voltage in the battery (remove the spare tire), not in the jump starter connections under the bonnet. The jump starer connections don't show it. Ask me how I know😂

Post #614263 30th Nov 2021 1:25pm
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