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Possible duff battery. How to test?


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Put the Ctek on again at the weekend and was dismayed to later find the red error light on and the charger 'stuck' at 5. The manual indicates this is likely due to the battery not taking a charge, however it's only 15-16 months old. Tried switching to Recondition mode but same result. Have used the Ctek at other times recently, no problem. How do I check the battery condition for sure? I see Ebay and elsewhere full of cheapo Chinese testers but are they any good? Have also seen mention of using multimeter but have zero electrical knowledge. Ideally don't want to find the car doesn't start come end of lockdown! 

Edited by red rocket
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Does the car start now? If so more likely a fault with the ctek and not the battery.

Edited by Boxob
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What's the voltage when engine off? 

Then monitor the voltage and see if it drops off

e.g

11.9v today

11v tommorow

10.2 day after

Then its the battery not holding charge for a long time and basically faulty. 

 

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51 minutes ago, Boxob said:

Does the car start now? If so more likely a fault with the ctek and not the battery.

Yes, maybe very slightly sluggishly but that could just be me worrying about it. Have now connected ctek direct to battery rather than cig lighter just in case that makes any difference, which i assume it shouldn't. Only had the ctek about a couple of years so equally annoying if that's faulty!

22 minutes ago, Pinewood said:

What's the voltage when engine off? 

Then monitor the voltage and see if it drops off

e.g

11.9v today

11v tommorow

10.2 day after

Then its the battery not holding charge for a long time and basically faulty. 

 

Yes, have done some more reading up and seen vids on Youtube. If problem persists i think i'll buy a cheap multimeter.

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Update: problem persists so looks like i need a multimeter.

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Measuring the voltage isn't really going to tell you much. 

I expect your battery is just fine, but if you want to be sure then you need to get it load tested which will tell you the cca (cold cranking amps) 

 

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26 minutes ago, PaulQ said:

Measuring the voltage isn't really going to tell you much. 

I expect your battery is just fine, but if you want to be sure then you need to get it load tested which will tell you the cca (cold cranking amps) 

 

Thanks. Yes, already picked that up from YouTube vids etc. Currently have charger on Skoda to see whether it's charger at fault.

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2 hours ago, red rocket said:

Update: problem persists so looks like i need a multimeter.

Are you using any of the Ctek extension cables? I had a problem with mine that was caused by one of my extensions having failed. Plugging CTEK end directly into whatever adaptor you have to connect to car should help you confirm that

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27 minutes ago, Gutley said:

Are you using any of the Ctek extension cables? I had a problem with mine that was caused by one of my extensions having failed. Plugging CTEK end directly into whatever adaptor you have to connect to car should help you confirm that

Only using the standard attachments. Have now tried both the cig lighter attachment and the direct to battery clip attachment and both produced the error. Meantime used the direct to battery attachment on Skoda with no issue. As a final check have reconnected the Boxster via the cig lighter and the error has reappeared so definitely looks like a duff battery which i will take up with supplier (Tayna).

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Update: bought a multimeter which shows voltage around 11.9, cold crank drops to around 9 and with engine running over 14 even with headlighta, aircon and heated screen. So alternator evidently ok and battery duff. Spoke to Tayna but i have to send battery back to them to check. Not surprising really.  They can organise cheap courier collection but not sure how i'm going to pack it!

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Yeah that points to battery and not the alternator as you say. At least you have found the root cause now 👍🏽

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19 hours ago, Pinewood said:

Yeah that points to battery and not the alternator as you say. At least you have found the root cause now 👍🏽

This ^^^

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  • 2 weeks later...

Update: replacement battery en route to me however Tayna are refusing to refund the £10.19 it cost me to return the original, equivalent to approx 12.5% of original cost and wiping out whatever my initiwl saving was. Have pointed out that this is poor customer service and a guarantee of a lost customer and awaiting response. Anyone know whether i have any statutory rights to refund of costs? About to Google it myself.

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Update (2): after i pointed out to Tayna that i believe i have a right to refund of my return shipping costs under the Consumer Contracts Regulations they have agreed 'as a gesture of goodwill'. ;)

Just hope the replacement battery doesn't go duff!

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