SL55/63/65/R230 AMG: disconnecting trunk battery for a month - effect???
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Senior Member
Joined: Jul 2013
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From: West Chester, PA - USA
2003 SL55 AMG
disconnecting trunk battery for a month - effect???
My '03 SL55 AMG will be stored for at least a month, and perhaps several months over the winter. I had it stored for a month this past summer and put a battery maintainer on both the starting battery and the one in the trunk - no issues upon returning.
Does anyone have any experience with the effects from disconnecting either or both batteries for extended periods of time - to keep them from discharging when the car is not driven?
Any experience or information would be greatly appreciated.
Gary-
Does anyone have any experience with the effects from disconnecting either or both batteries for extended periods of time - to keep them from discharging when the car is not driven?
Any experience or information would be greatly appreciated.
Gary-
Member
Joined: Jan 2011
Posts: 237
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CLK320, ML550, SL55, GL450
If you already have the trickle charger.. I'd use it.
I imagine you'll have to re-program everything (memory function items/seat/radio codes etc)
Would keys even need reprogramming I'd wonder if it went completely dead.
Don't batteries go stale as well just sitting there?
I imagine you'll have to re-program everything (memory function items/seat/radio codes etc)
Would keys even need reprogramming I'd wonder if it went completely dead.
Don't batteries go stale as well just sitting there?
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Joined: Feb 2009
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From: Central WI (BFE)
SL55, ML500 & Acura TL
+1 I'd stay with the trickle charger as well, but think you only need one on the trunk battery.
I put my SL to bed every winter and have for years. I plug the charger into the harness that I leave connected to the battery all of the time. The car has set as long as six months and fires up like a champ every spring.
One thing i have never done is put fuel stabilizer in the tank. I have never had any issues, but am thinking about putting some in this year.
I do think you would be fine removing both batteries if you chose to. I think all programmable setting would go back to defaults. It seems like the keys would be fine. If you go that route, give the car a few minutes before trying to start after connecting up the batteries. I read somewhere that the ECU will need a minute or so to reboot itself. i also read that disconnected batteries should be trickle charged from time to time so I don't see much advantage to removing them.
I put my SL to bed every winter and have for years. I plug the charger into the harness that I leave connected to the battery all of the time. The car has set as long as six months and fires up like a champ every spring.
One thing i have never done is put fuel stabilizer in the tank. I have never had any issues, but am thinking about putting some in this year.
I do think you would be fine removing both batteries if you chose to. I think all programmable setting would go back to defaults. It seems like the keys would be fine. If you go that route, give the car a few minutes before trying to start after connecting up the batteries. I read somewhere that the ECU will need a minute or so to reboot itself. i also read that disconnected batteries should be trickle charged from time to time so I don't see much advantage to removing them.
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From: Welwyn, Herts, UK
2006 S600
Keep the fuel tank full so you don't get condensation inside due to the tank breathing.
Batteries MUST be kept charged up - never let them go below 12.4V. Might need trickle charging once a month - maybe once a week - whatever's necessary. Keys will be fine.
Lots of warnings go off when you re-connect, but nothing to worry about if the car is kept dry.
I wouldn't disconnect a battery if you don't have to - but it does need to be kept charged.
Nick
Batteries MUST be kept charged up - never let them go below 12.4V. Might need trickle charging once a month - maybe once a week - whatever's necessary. Keys will be fine.
Lots of warnings go off when you re-connect, but nothing to worry about if the car is kept dry.
I wouldn't disconnect a battery if you don't have to - but it does need to be kept charged.
Nick
Last edited by Welwynnick; Oct 27, 2013 at 02:03 PM.
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