Discussion
Battery flat on my 2005 crossfire ( it was work you yesterday when I took it out of my garage to wash it).
Connected my 12V battery conditioner to the cigarette lighter and I'm getting a warning sign.
I am presuming that if the battery is flat the conditioner won't charge the battery.
Any advice please ?
Connected my 12V battery conditioner to the cigarette lighter and I'm getting a warning sign.
I am presuming that if the battery is flat the conditioner won't charge the battery.
Any advice please ?
Depends on how low the voltage has dropped and the charger. Most will need to 'see' a fixed voltage before it 'thinks' it's connected and then charges. Some are better tyhan others but if it's dropped so low, the batter will be shagged anyway and charging won't 'fix' it. Also, charge it direct, don't use the cigarette lighter connection.
What's the voltage off charge after say, 1 hour?
What's the voltage off charge after say, 1 hour?
Most modern chargers fail to charge a totally flat battery.
What I do in these circumstances is either use the ancient charger I've had for years (if I can find it!) or connect another battery with jump leads. This will allow a modern charger to start working and charge the battery. If the battery fails to hold charge, it's probably knackered.
What I do in these circumstances is either use the ancient charger I've had for years (if I can find it!) or connect another battery with jump leads. This will allow a modern charger to start working and charge the battery. If the battery fails to hold charge, it's probably knackered.
I've successfully recovered a few 'dead' batteries that were below 9v and had been discarded by their owners using a Ring smart charger https://www.ringautomotive.com/en/product/RSC612
My battery went flat a while back and the RAC informed me the battery was kac#$#$ and needed replacement. Jump started the car and it has been perfect since .
Most machines will show up phantom faults if the battery is really flat , I had left a phone charger plugged in and not used the car for over 10 days .
I do have a new battery sitting in the boot just in case .
Most machines will show up phantom faults if the battery is really flat , I had left a phone charger plugged in and not used the car for over 10 days .
I do have a new battery sitting in the boot just in case .
Had this a few times on my track car cos it sat alot between uses, charger wouldn't cut the mustard from flat, but if a jumped the car from another car, or bump started it, went for a quick spin then came home and plugged it in the charger did it's thing.
Chargers seem fine from almost flat but not fully flat
Chargers seem fine from almost flat but not fully flat
Roboticarm said:
Had this a few times on my track car cos it sat alot between uses, charger wouldn't cut the mustard from flat, but if a jumped the car from another car, or bump started it, went for a quick spin then came home and plugged it in the charger did it's thing.
Chargers seem fine from almost flat but not fully flat
Smart chargers require a minimum voltage in order to detect they have been connected with the correct polarity.Chargers seem fine from almost flat but not fully flat
Charging via the cig lighter will obviously only work if the cig lighter is live all the time, in many modern cars this isn't the case and they require the ignition to be switched on (or to accessory).
If it was mine I would:
1. Remove battery from car
2. Charge on bench with crocodile clips
3. If not working, add a second 12v battery in parallel and charge on the bench with crocodile clips until voltage is high enough for trickle charger to work.
4. Remove extra battery then charge battery on bench.
You could try 1 and 2 on the car if you like (I guess even 3 and 4) but I just prefer everything to be on a bench if I'm having a problem.
This post pretty much summarises what other people have said though.
1. Remove battery from car
2. Charge on bench with crocodile clips
3. If not working, add a second 12v battery in parallel and charge on the bench with crocodile clips until voltage is high enough for trickle charger to work.
4. Remove extra battery then charge battery on bench.
You could try 1 and 2 on the car if you like (I guess even 3 and 4) but I just prefer everything to be on a bench if I'm having a problem.
This post pretty much summarises what other people have said though.
Edited by bluezedd on Wednesday 25th March 16:46
Gassing Station | Home Mechanics | Top of Page | What's New | My Stuff