If it is less than 11.5v or even 12v it would be fair to suggest the battery is probably beyond redemption.
old battery charger
- Thread starter norseman
- Start date
If it is less than 11.5v or even 12v it would be fair to suggest the battery is probably beyond redemption.
Sponsored Links
A 10amp charger is only one limited to 10amps output. Once a battery has settled down to a charge, the charge current will drop considerably as the voltage rises. The minimum time I would expect to have a battery on charge is 24 hours, I would expect your 90 amp job to need 30+ hours, depending on how much discharged.
Yes, a modern Smart battery charger can just be connected and left to get on with it. It will decide the voltage, charge rate to apply and when the battery is fully charged.
I now give me car's battery a 20 minute top up, each day it is parked in my garage.
Thank you both for the replies.
I have ordered a Hilka 12A/4A smart charger … this will hopefully give me the best choice of change rates, depending on the state of the battery(s)
One car runs 90AH the other 72AH. The larger has removable plugs, the other is sealed & has a pretty green indicator to tell me if it's fully charged.
I shall research my choices more carefully when the 90AH (which I'm still dubious about) needs replacing
A very Merry Christmas to you all, as for 2021 …
I have ordered a Hilka 12A/4A smart charger … this will hopefully give me the best choice of change rates, depending on the state of the battery(s)
One car runs 90AH the other 72AH. The larger has removable plugs, the other is sealed & has a pretty green indicator to tell me if it's fully charged.
I shall research my choices more carefully when the 90AH (which I'm still dubious about) needs replacing
A very Merry Christmas to you all, as for 2021 …
Did you mean 12V 4A?
Sponsored Links
Sorry I didn't express myself better, a 12 volt charger with 12A or 4A charge options.
Last edited:
What on earth makes you think that ? If it had an o/p of 12v it would start a car without any problem.
Experience of batteries being flat and not being able to start cars. 12v means the battery is below 25% capacity, which puts the battery well into the very lucky if it can crank an engine over range. My engine is very heavy to crank over and would not even attempt to crank at 12v - it checks the battery volts before attempting to crank.
Its normal with a fully charged battery for the voltage to drop to 9.5v during cranking and much less than that with poor battery. Modern cars have a lot of electronics and the electronics systems need to work during cranking, or the engine will be unable to start.
https://batteryworld.varta-automotive.com/en-gb/battery-test-car
The result of using an inappropriate charger
Sponsored Links
