SL-Class (R231) 2013 on: Discussion on the SL550

SL/R231: where in trunk is battery?

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Old Nov 24, 2017 | 06:07 PM
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Mikeiaz's Avatar
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sl550
where in trunk is battery?

OK I searched former posts but really would like to know where exactly in the trunk the battery is located before I just start trying to remove trim panels blindly. THX
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Old Nov 24, 2017 | 06:16 PM
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I believe it is now behind the passenger seat.
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Old Nov 30, 2017 | 06:24 PM
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R231 SL550
Originally Posted by Mikeiaz
OK I searched former posts but really would like to know where exactly in the trunk the battery is located before I just start trying to remove trim panels blindly. THX
Trunk battery is primary battery for starter and ignition coils; you remove the flat trunk base and then remove the carton under this; the battery is secured with a nylon harness and also with a retaining plate at its base - be sure not to damage the acid straw when removing. For the trunk battery you can use a less-expensive Bosch AGM - this battery is available at PepBoys and often has rebates - I bought one online back in March for only $185 out-the-door; OEM part number is 0055411001.

The auxiliary battery is located behind the passenger seat and can only be an OEM Fiamm - I tried using a supposed Bosch equivalent and the terminals were all in different spots with no acid breather straw connector; OEM part number for this is 2115410001.
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