Charging C5 2.2 HDi (2007) battery

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Michel
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Charging C5 2.2 HDi (2007) battery

Post by Michel »

Hello all,

I need to charge the battery up in a certain C5 that seems to have limpeted itself to my driveway.

I’ll use the smart charger I bought off Zel a while back - do I need to go through the whole shutdown procedure and disconnect the battery, or can I just attach the charger as is with the battery still connected?
Thanks
Mike
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Re: Charging C5 2.2 HDi (2007) battery

Post by GiveMeABreak »

It is not absolutely necessary to disconnect the old battery - however, it is an additional safety precaution to do so in case of crossing the terminals / shorting with a tool accidentally. If the battery terminals are disconnected (or at least the negative is), then there is no risk of frying an ECU which we have seen numerous times here and that can be expensive.

If you are going to disconnect the negative - then I would advise following the procedure. If you need access to the vehicle while charging - just manually latch the door lock (s) with a screwdriver, so the RCD circuit will be fooled into thinking the doors are shut and allow the other relevant ECUs to sleep, like the suspension ECU etc.

When I do this, I disconnect the negative terminal and insulate it with some rags so it can't make contact again.
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Re: Charging C5 2.2 HDi (2007) battery

Post by wheeler »

Michel wrote: 20 Jul 2021, 13:11 can I just attach the charger as is with the battery still connected?
As long as you are using a smart charger then yes you can.
It is sensible however once the key is out wait 4 minutes or so to allow the network to go to sleep so there is as low a load as possible on the battery when you connect the charger.
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Re: Charging C5 2.2 HDi (2007) battery

Post by Michel »

Thanks both :)
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GiveMeABreak
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Posts: 36992
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
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Re: Charging C5 2.2 HDi (2007) battery

Post by GiveMeABreak »

Absolutely agree regarding the Smart Charger - I forgot to mention that as it will prevent reverse polarity and over-charging.
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Marc
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