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HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

Recharging the battery with alarm set.

After a week working away I came home to find the battery of my car completely discharged. After using the key to access the car I started to recharge the battery (which was down to 5.1 V). Despite charging at 6 A, it has reached a point where it just has enough juice for the alarm to (briefly) flash the indicators and chirp the sounder, which seems to discharge it again. It isn't possible to disarm the alarm with the remote. I'm assuming that the alarm / immobiliser will prevent jump-starting (which would be tricky given its location).

Any suggestions as to how I might break this empasse?

Thanks,

Hugh

Fri Nov 15 2019 12:20pm

Lindab

Member Since: 20 Nov 2017
Location: Dundee
Posts: 923

May be wrong, but if you have only been away a week & its down to 5v I think you have a dead cell

Fri Nov 15 2019 1:08pm

jimbg

Member Since: 29 Jan 2013
Location: By the River Dart
Posts: 1878

2013 Range Rover Sport SDV6 HSE Orkney Grey

Tend to agree, not sure that one is not coming back! 2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!

Fri Nov 15 2019 1:19pm

knwatkins

Member Since: 09 Sep 2018
Location: Poole, Dorset
Posts: 1139

2010 Range Rover Sport 3.0 TDV6 HSE Stornoway Grey

Is that your new Bosch one Hugh? Kev

MY2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Fri Nov 15 2019 1:27pm

Andy K

Member Since: 18 Sep 2015
Location: GL
Posts: 5040

2005 Range Rover Sport TDV6 HSE Rimini Red

well the obvious thing is to disconnect the battery from the car (one terminal)
and connect the charger directly

Fri Nov 15 2019 1:31pm

HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

Duh yeh right obvious. D'oh!

Fri Nov 15 2019 1:50pm

jimbg

Member Since: 29 Jan 2013
Location: By the River Dart
Posts: 1878

Good Luck, I hope it comes back. 2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!

Fri Nov 15 2019 1:56pm

HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

HughN wrote:
Duh yeh right obvious. D'oh!

It has been a very, very long week! I think I used up all intellectual capacity on "hard sums".

Fri Nov 15 2019 2:54pm

aaronjb

Member Since: 26 Jun 2019
Location: Northampton
Posts: 447

Lindab wrote:
May be wrong, but if you have only been away a week & its down to 5v I think you have a dead cell

Not just one at that point either, probably, at ~2V per cell..

If you have a Ctek or similar, a desulphate cycle might rescue it, if you're really lucky.. 2014 BMW 530d Touring, 2006 BMW 650i, 2018 Mini Cooper S

Fri Nov 15 2019 3:02pm

HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

knwatkins wrote:
Is that your new Bosch one Hugh?

It is.

If it is dead, I do have the receipt.

It does seem to be recovering via the clever charger.

Fri Nov 15 2019 3:02pm

HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

All sorted.

Giving it a desulphate cycle overnight.

Fri Nov 15 2019 5:35pm

knwatkins

Member Since: 09 Sep 2018
Location: Poole, Dorset
Posts: 1139

HughN wrote:
knwatkins wrote:
Is that your new Bosch one Hugh?

It is. If it is dead, I do have the receipt.

It does seem to be recovering via the clever charger.

Well that's disappointing. I would be tempted to return it anyway, they really don't like being discharged that low so it may have reduced the life of it somewhat.

Kev

MY2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey

Fri Nov 15 2019 8:31pm

jimbg

Member Since: 29 Jan 2013
Location: By the River Dart
Posts: 1878

Hugh,

What was the final outcome of your battery saga? 2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!

Fri Nov 22 2019 9:43am

HughN

Member Since: 10 Sep 2017
Location: Near Llanybydder
Posts: 651

The final outcomes are:

a) It was fine after a repair cycle by my Ring charger and (touch wood) has been fine since;
b) The evidence of me not spotting the obvious solution was sufficient indication that I need a much-deserved break, so I'm taking one!

Hugh

Mon Nov 25 2019 3:17pm

jimbg

Member Since: 29 Jan 2013
Location: By the River Dart
Posts: 1878

2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!

Mon Nov 25 2019 4:39pm

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