 | Home > In Car Electronics > Battery Change question. |
 
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8152   
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will it not only be a battery code you loose?
but yes plug it in to a live 12v socket. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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2nd Mar 2017 8:47pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720  
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it'll only be the radio code you lose, takes a few seconds to re-enter it.
One problem you'll have is the cigar lighter is only live with the ignition on, and disconnecting the battery with the ABS and engine ECU's powered up probably isn't a good idea. There is also a risk with those memory saver things that if the battey positive cable touches the body while you're swapping the battery it'll blow the fuse for the cigar lighter anyway. If you've got the radio code i wouldn't bother, just change the battery and re-enter it when you're done. |
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3rd Mar 2017 4:16am |
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| Alien Member Since: 18 Jan 2015 Location: Bacchus Marsh Posts: 230 
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My hand books says to( or similar)...
Start by turning the ignition on Turn the ignion compeatly off. Within 17 seconds disconect the battery. I assume this is to do with the alarm system so always do it. The radio while a pain to enter the security code and possibly restore the stations is a safer bet than possible damage to other systems. The plug in radio savers where popular back when there were less electronics involved in vehicles. Cheers, Kyle. |
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3rd Mar 2017 4:27am |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3650 
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the owners manual tells you haw to do it I did mine as it states and no issues with anything not even the radio DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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3rd Mar 2017 6:25am |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831 
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Well there goes my good idea, blown out of the water like a sitting duck. Will have to get someone to help as I have practiced with out disconnecting the battery the 17 second trip round the vehicle and failed and the radio code was stuck to the radio by S.H.M.B.O. so the radio will have to come out first.
I was under the impression that the alarm had to be reset along with the E.C.U. and radio when the battery had been disconnected. Don't make old people mad. We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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3rd Mar 2017 9:25am |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720
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the 17 sec thing is just so your alarm doesn't go off when you disconnect the battery, but only if you have the battery back up sounder. If you don't wait the 17 sec, the alarm will just go off. But once you reconnect the new battery you can silence the alarm with your remote. If you don't have a battery back up sounder fitted it wont go off.
There's nothing to reset with the "ECU". It's only the radio you need to enter the code for. |
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3rd Mar 2017 9:57am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17551 
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Only the radio will need resetting.
You can always loosen the clamp bolt on the neg battery terminal before cycling the ignition, also you can reach the ignition key from the passenger side while standing by the battery compartment, so getting a lead off in the required time isn't difficult. The only reason there is a time limit is to prevent the BBUS sounding. If you don't have a BBUS you can take as long as you like, as far as I know. Aftermarket radios are a major PITA compared to the original, since they all seem to have psychedelic Corsa-friendly boy racer demo modes, weird colours, and 200+ pointless settings that need re-entering after a power down! |
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3rd Mar 2017 10:02am |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831
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Thank you for the replies and advice, it is an age thing now I'm getting my state pension my mind starts playing tricks. Don't make old people mad.
We don't like being old in the first place, so it doesn't take much to us off.
Richard |
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3rd Mar 2017 10:30am |
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| discomog Member Since: 09 May 2015 Location: Notts/Lincs Border Posts: 2532 
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I recently disconnected the battery due to a fault on one of the horns (continually blowing at 03.00hrs and didn't have a torch to locate the fuse). Once it was daylight I pulled the horn fuse and reconnected the battery. Everything worked fine and didn't even have to reset the radio code. I wouldn't hesitate in following the procedure in the handbook by turning the ignition on and off and disconnecting within the time period. Defender 90XS SW
Mini Countryman Cooper S Morgan Plus 8 |
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3rd Mar 2017 11:35am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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I know some people would frown upon this but, what is stopping you attaching jump leads to the clamps on the old battery and connecting in series the new battery posts. Undo the claps on the old battery and take it out of the way, place the new battery, complete with jump leads into place and by touching the jump lead ends put the clamps onto the new battery posts and take away the jump leads without breaking a continuous 12V supply.
Or even put a 12V supply to a permanent live via jump leads say to the starter motor or via the permanent live found in the grey caravan plug if fitted. |
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3rd Mar 2017 1:19pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17551
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^^ I think you mean parallel not series, and I think the reason is probably a reluctance to set his Defender on fire, and or burn/blind himself with the arcing that will result when it all goes horrbly wrong!
Certainly not something I would try 
Connecting a fused, low current supply to a permanent live would work, but it would need to be fused due to the risk of the +ve battery lead touching the vehicle body or chassis whilst the batteries are swapped. Do not underestimate the destructive power of a very high current 12V DC supply. It will easily blow holes in bodywork, blow chuncks off battery posts, start fires, weld things togather, and cause life changing injuries. A dead short across the battery will produce a current of many hundreds of amperes. |
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3rd Mar 2017 1:41pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443
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I agree the fidling with battery leads and jump leads in the underseat battery compartment isn't the brightest of ideas but a slave battery on the starter via jump leads would be fairly possible with care, especially as the vehicles battery terminals would still be live and they're easy to knock against the compartment sides.
Yes I can attest to the destructiveness of letting 12V power leads touch the wrong parts! Just so people are aware, you can do some fairly passable arc welding with 12V, you only have to look on You Tube for some of the antics those rednecks do when attempting bush mechanics!  |
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3rd Mar 2017 2:32pm |
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| AMBxx Member Since: 24 Jul 2016 Location: York Posts: 1036 
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I have a small piece missing from one end of a spanner that is testament to that - slipped when tightening one of the terminals! Radio code was fine though |
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3rd Mar 2017 2:56pm |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831
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So I decided to do it the Land rover way. Into the cubby box to retrieve the radio keys ( see comment about the radio code) which I had placed in there about three years ago. They have gone, S.H.M.B.O. asks what I'm looking for so I tell her "Oh right" and she walks off back into the house coming back ready to go out puts passenger seat back in. I ask her what she is doing "Erm I need to go out to buy some more bits of metal I through out thinking they were rubbish."
 Don't make old people mad.
We don't like being old in the first place, so it doesn't take much to us off.
Richard |
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3rd Mar 2017 3:49pm |
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