Disconnecting battery

macs · Aug 5th, 2014, 14:39

Can anybody tell me if it's ok to disconnect the battery for prolonged period (e.g. overnight for charging)? The car is V70 D5 2009.
Thanks.

500tie · Aug 5th, 2014, 20:14

No reason why you can't disconnect it for any period of time mate

macs · Aug 5th, 2014, 21:01

Thanks, I was in doubt after some contradicting opinions on the net like 'on modern cars some important codes may be lost' etc.
Anyway, I found the battery completely flat with only 8V. The voltage recovered a bit after I disconnected the negative lead. I have current drain of ca. 2A and can't locate it. Tried removing fuses one by one to no avail....

500tie · Aug 6th, 2014, 20:32

There is a chance that you could lose the radio code but that'll be in your handbook in fact I'm not even sure that Volvos have coded radios. Your ecu etc will be fine with a disconnected battery. Your drain I can't really help you with mate could be anything from a light being left on somewhere to your a/c compressor not shutting off when you turn the engine off sorry to not be of any more help mate

H20 VOLVO · Aug 6th, 2014, 20:44

Alternator shot? If the capacitor (iirc) goes, it allows it to drain even when off? Sketchy memory - been a while since I did an alternator!

macs · Aug 6th, 2014, 22:20

The saga continues...
In fact I found one fuse in the end that made the current draw drop from 2A to 1A, which is still too high. It's the 10A fuse 'RTI and park camera'.
I put the battery on the charger for a few hours today before attempting a jump start. The car made the usual noises but didn't start. A message came up 'bonnet open'... Now the battery is back on the charger overnight...

The funny thing is that the car was perfect before I went for the free summer check at the dealer last Thursday. I parked the car on Fri after work as usual and it would not start on Monday morning. I am booked again to let them look at it this Saturday.

500tie · Aug 7th, 2014, 06:09

Could be that your battery is completely toasted mate. Cars do funny things with knackered batteries

macs · Aug 8th, 2014, 14:11

Hi guys,
In the end I went and shelled out for a new battery, after the car failed to start on the old re-charged battery.
All seems perfect again! No more current drain either!

Seems the battery had some sort of internal short...

Cheers.

500tie · Aug 8th, 2014, 15:16

No worries bud glad you've got it sorted now though

Aug 5th, 2014, 14:39	#1
macs Member Last Online: Today 18:14 Join Date: Dec 2008 Location: Swindon	Disconnecting battery Can anybody tell me if it's ok to disconnect the battery for prolonged period (e.g. overnight for charging)? The car is V70 D5 2009. Thanks.

Aug 5th, 2014, 20:14	#2
500tie Member Last Online: Feb 4th, 2024 12:48 Join Date: Jul 2014 Location: Swindon, Wilts	No reason why you can't disconnect it for any period of time mate __________________ Sooty... 1997 V70 2.5 10v SE

Aug 6th, 2014, 20:32	#4
500tie Member Last Online: Feb 4th, 2024 12:48 Join Date: Jul 2014 Location: Swindon, Wilts	There is a chance that you could lose the radio code but that'll be in your handbook in fact I'm not even sure that Volvos have coded radios. Your ecu etc will be fine with a disconnected battery. Your drain I can't really help you with mate could be anything from a light being left on somewhere to your a/c compressor not shutting off when you turn the engine off sorry to not be of any more help mate __________________ Sooty... 1997 V70 2.5 10v SE

Aug 7th, 2014, 06:09	#7
500tie Member Last Online: Feb 4th, 2024 12:48 Join Date: Jul 2014 Location: Swindon, Wilts	Could be that your battery is completely toasted mate. Cars do funny things with knackered batteries __________________ Sooty... 1997 V70 2.5 10v SE

Aug 8th, 2014, 14:11	#8
macs Member Last Online: Today 18:14 Join Date: Dec 2008 Location: Swindon	Sorted with a new battery Hi guys, In the end I went and shelled out for a new battery, after the car failed to start on the old re-charged battery. All seems perfect again! No more current drain either! Seems the battery had some sort of internal short... Cheers.

Aug 5th, 2014, 21:01	#3
macs Member Last Online: Today 18:14 Join Date: Dec 2008 Location: Swindon	Thanks, I was in doubt after some contradicting opinions on the net like 'on modern cars some important codes may be lost' etc. Anyway, I found the battery completely flat with only 8V. The voltage recovered a bit after I disconnected the negative lead. I have current drain of ca. 2A and can't locate it. Tried removing fuses one by one to no avail....

Aug 6th, 2014, 20:44	#5
H20 VOLVO Senior Member Last Online: May 8th, 2018 14:08 Join Date: May 2011 Location: Yorkshire	Alternator shot? If the capacitor (iirc) goes, it allows it to drain even when off? Sketchy memory - been a while since I did an alternator!

Aug 6th, 2014, 22:20	#6
macs Member Last Online: Today 18:14 Join Date: Dec 2008 Location: Swindon	The saga continues... In fact I found one fuse in the end that made the current draw drop from 2A to 1A, which is still too high. It's the 10A fuse 'RTI and park camera'. I put the battery on the charger for a few hours today before attempting a jump start. The car made the usual noises but didn't start. A message came up 'bonnet open'... Now the battery is back on the charger overnight... The funny thing is that the car was perfect before I went for the free summer check at the dealer last Thursday. I parked the car on Fri after work as usual and it would not start on Monday morning. I am booked again to let them look at it this Saturday.

Aug 8th, 2014, 15:16	#9
500tie Member Last Online: Feb 4th, 2024 12:48 Join Date: Jul 2014 Location: Swindon, Wilts	No worries bud glad you've got it sorted now though __________________ Sooty... 1997 V70 2.5 10v SE

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