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How to change the Battery on an is250


Description

is250/is220d

Please ensure you have the correctly orientated battery for your car connections. Do a visual check before you commence this proceedure.

If I remember correctly all you need is a 10mm spanner/socket and some petroleum jelly.

Unlock the car, you do not want the alarm going off when you connect the new one!!

Disconnect the NEGATIVE lead first, using the 10mm spanner, and move the lead to one side to avoid sparking.

Disconnect the POSITIVE lead and move the lead to one side to avoid sparking.

Undo the battery hold down clamp and put the nut somewhere safe, in your pocket is not a bad place.

Disconnect the wired connection on the left hand side of the plastic collar that covers the battery. With a bit of jiggling this collar can be lifted off the battery. You can now lift out the old battery. At this point, check that the umbrella shaped hold down strap bolt has not come out of its slot. The plastic cover removal can move it from where it should be. Check it and tape or tie it up.. now. Replacing the plastic cover is even more likely to move it out of position!!

Carefully lift in your new battery to its position, (remembering to orientate it the correct way!)

Refit the plastic cover and re-attach the wired connection on the left side of the cover.

Re-attach the hold down strap and re-connect the battery terminals starting with the POSITIVE lead. Cover any exposed terminal parts with Petroleum Jelly to prevent corrosion.

Start the car!! Should take no more than 30 mins.

You will need to ‘resync’ the electric window operations as described on page 45 of the Owners Manual.


Extra Fields

General

  • Time Taken?
    30 - 40 mins
  • Tools Used?
    10mm spanner
  • List Parts Used?
    Petroleum jelly
  • Difficulty Level? 1-5
    1
  • Like 3
  • Thanks 1

User Feedback

Recommended Comments

Please advise on how to remove the wired connection on the left hand side of the plastic collar that covers the Battery? It seems by pressing it should slide off however no luck.

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Sorry...had no idea this question was here. Only just saw this.

You are right, its a press and pull apart a bit like the headlight bulb connector

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And, you should add that if you have a extra Battery around, you should connect it to the the leads before removing them frlm the old Battery. This way, the power is never lost, and the windows should stay programmed with tge clocks, memory seats and steering wheel. 

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OBDII memory saver makes life easier when disconnecting batteries for replacement or other services. 

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Can anyone clarify which bit of the IS250 Battery temperature sensor needs to be squeezed to allow it to be disconnected? I don't want to put too much pressure on it as the Battery casing looks fragile. The sensor is circled red on the attached image.

 

battery temperature sensor.jpg

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