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Battery help

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12 Jan 2021 13:54 #231732 by Rambo
Battery help was created by Rambo
Hi everyone so I know I'm going to sound completely dumb but last night when I'd just rushed out of work my car wouldn't start! It took prob 9 attempts before it started and it wasn't that cold either. The last time this happened the battery needed charging so I just took the battery off to charge it but it's showing fully charged!

Now I do usually get someone else to sort the battery for me but this time I thought I could do it only I now can't get the battery holder back on. There is a hook hole on one side but not the other, should the other side go under the battery tray? If so how as it doesn't seem to reach

Also any ideas why it wouldn't of started if it's not the battery or what to check? 

Thanks 

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12 Jan 2021 14:21 #231733 by 300bhpton
Replied by 300bhpton on topic Battery help
9 attempts sounds a lot for a battery issue. What exactly was it doing?

A flat battery either won't turn the engine over (the starter motor may click) or the engine turns over very slowly once or twice. And each attempt will get worse and do less, until it will do nothing but dim the dash lights when you turn the key.

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12 Jan 2021 14:37 #231735 by Roger Fairclough
Replied by Roger Fairclough on topic Battery help
I agree with 300bhpton.

We need more info.so what generation, what engine and details of service would help.

Roger

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12 Jan 2021 14:54 #231736 by DrRobin
Replied by DrRobin on topic Battery help
On my Gen 3 there are two holes in metal lugs set about 30mm up from the battery tray, these are where the holder rods go in. The one towards the engine is difficult to see on my Jimny, but if you take the battery out you will see where they are.

As to why it wouldn't start, it's not the battery, more likely fuel, possibly water in the fuel or some other ignition fault, plug leads, plugs, it's a long list. I am assuming that the engine turned over at thwe normal speed?

When I start a car I always depress the clutch to take the load of the gearbox off the starter motor. If it doesn't start I usually give it a small bit of throttle, this sometimes helps.

2011 Blue Jimny SZ3, Xtrons Head Unit, DAB, Front and Rear Cameras, TPMS, K&N, Bosch Aerotwin blades, LED side and interior lights, boot light, parcel shelf, boot box, dash box. Osram Nightbreakers, CTEK Battery Sense.

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12 Jan 2021 15:49 #231743 by Rambo
Replied by Rambo on topic Battery help
So I've just taken the battery back out and have now found where both battery holder rods go - thanks 

It's a 2004 1.3, it wasn't clicking like a dead battery would do, it was turning over really slowly but wouldn't start, I did also try a couple of times with the clutch down but that didn't help so I left it for 10 minutes, tried again then it just started fine but if it could be something that may get worse I don't want to leave it in case I end up getting stuck somewhere

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12 Jan 2021 16:29 #231744 by 300bhpton
Replied by 300bhpton on topic Battery help
Could be a dodgy earthing strap, they can corrode over time. So might be worth replacing and seeing if it helps.

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12 Jan 2021 17:50 #231747 by RainerK
Replied by RainerK on topic Battery help
The battery showing fully charged does not necessarily mean that the battery is ok. I would check the voltage while starting the engine, then you would know if the battery really is ok.

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12 Jan 2021 21:36 #231756 by GeorgeC
Replied by GeorgeC on topic Battery help
All the advice above is good and correct, particularly the age related comments.

May I add some basic science, Specific Gravity, this relates to temperatue and state of charge and is the only true indicator of battery health.

When I lived in Jersey, I had a "no starter motor/use the crank handle" temp, and a "no crank handle/no alternator light" temp as well, thats when I got a lift to work. When things returned to normal, above 4 degrees C, it started ok! 

May I suggest a web page called "Battery University", there are many pages on the science, I won't point you to a specific one, you fill find one to meet your needs.
 

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13 Jan 2021 14:57 #231766 by Roger Fairclough
Replied by Roger Fairclough on topic Battery help
You could have a problem with the starter motor solenoid. Every time you use the s/motor the heavy current burns the contacts and over time this burning will destroy the copper contacts. It's another possible reason for your problem but can be cured with a re-build using new contacts.

Roger

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13 Jan 2021 16:01 #231769 by DrRobin
Replied by DrRobin on topic Battery help
Turning over slowly indicates an electrical problem of some description, either the battery, cables, earth strap solenoid has a problem and cannot supply the correct current or your starter motor is faulty.

Put a voltmeter on the battery and then try to crank the motor over, does the voltage drop a lot? If not then the battery might be okay, but you can't get enough current to the motor or the motor is dying.

If the voltage drops a lot your battery has some type of problem which is limiting the current, you can get a get meter which measures cranking current (Ancel BA101, etc), but they are about £45, so cheaper to take it to a garage. This could be any number of things as others have already suggested.

If the voltage is okay, then something else is limiting the current, are the battery terminals clean and tight? Is the earth strap clean and secured correctly?

After that it will be wiring, solenoid or starter motor, these might not be easy to check if you don't have the equipment, so it might be a trip to a garage.

2011 Blue Jimny SZ3, Xtrons Head Unit, DAB, Front and Rear Cameras, TPMS, K&N, Bosch Aerotwin blades, LED side and interior lights, boot light, parcel shelf, boot box, dash box. Osram Nightbreakers, CTEK Battery Sense.

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19 Jan 2021 16:30 #231957 by Rambo
Replied by Rambo on topic Battery help
Thanks for the replies, I got a voltmeter and with the engine off the reading was 12.1 which I believe it should be 12.6 at least and on starting the engine it drops down to 8.5 then goes up to 14.7 so I think this means the alternator is ok and I should be looking at hopefully just replacing the battery? 

Thanks 

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19 Jan 2021 16:39 #231958 by DrRobin
Replied by DrRobin on topic Battery help
12.1V is fairly flat, but it does depend on temperature, if it is very cold it might be okay. However dropping to 8.5v is a sure sign of a dead battery.

If you charge the battery and it is still like that then the battery has died and you need a new one.

If it goes up to 14.7V when charging that indicates that the alternator is okay, but again the battery is dead, it should only reach 14.7 when fully charged.

2011 Blue Jimny SZ3, Xtrons Head Unit, DAB, Front and Rear Cameras, TPMS, K&N, Bosch Aerotwin blades, LED side and interior lights, boot light, parcel shelf, boot box, dash box. Osram Nightbreakers, CTEK Battery Sense.

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