Charging battery which is still connected
Will an automatic car battery charger trip out at the correct point
if the battery is left connected to the car? I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! Thank you for any views. Lem ------------------- BACKGROUND ... A thread last September in the uk.rec.cars groups called "Need to disconnect battery before charging?" http://snipurl.com/chww seemed to generally conclude that it is alright to charge a car battery without disconnecting it first. My battery charger is rated, by the manufacturer, at 11 Amps. It is probably not 11 Amps but it is bigger than I need for my old Mazda 1400cc car. It cuts out automatically when the battery is charged and the cutout has an selector for sealed batteries and non- sealed batteries. I think (not sure) it works at no more than 14.4 volts. This is it http://snipurl.com/chwx. Is it ok to leave this charger connected until it trips out or will the trip point be delayed by the presence of the car's elctrics in the circuit? |
On Thu, 03 Feb 2005 01:03:03 GMT, Lem wrote:
Will an automatic car battery charger trip out at the correct point if the battery is left connected to the car? I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! Thank you for any views. Lem ------------------- BACKGROUND ... A thread last September in the uk.rec.cars groups called "Need to disconnect battery before charging?" http://snipurl.com/chww seemed to generally conclude that it is alright to charge a car battery without disconnecting it first. My battery charger is rated, by the manufacturer, at 11 Amps. It is probably not 11 Amps but it is bigger than I need for my old Mazda 1400cc car. It cuts out automatically when the battery is charged and the cutout has an selector for sealed batteries and non- sealed batteries. I think (not sure) it works at no more than 14.4 volts. This is it http://snipurl.com/chwx. Is it ok to leave this charger connected until it trips out or will the trip point be delayed by the presence of the car's elctrics in the circuit? The electrics shouldn't make a big difference but if you need to keep recharging it that regularly then it's not going to last long regardless. |
"Lem" wrote in message ... Will an automatic car battery charger trip out at the correct point if the battery is left connected to the car? I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! Thank you for any views. Lem ------------------- BACKGROUND ... A thread last September in the uk.rec.cars groups called "Need to disconnect battery before charging?" http://snipurl.com/chww seemed to generally conclude that it is alright to charge a car battery without disconnecting it first. My battery charger is rated, by the manufacturer, at 11 Amps. It is probably not 11 Amps but it is bigger than I need for my old Mazda 1400cc car. It cuts out automatically when the battery is charged and the cutout has an selector for sealed batteries and non- sealed batteries. I think (not sure) it works at no more than 14.4 volts. This is it http://snipurl.com/chwx. Is it ok to leave this charger connected until it trips out or will the trip point be delayed by the presence of the car's elctrics in the circuit? My charger drops to a trickle mode. Very low amps to maintain the charge if I am absent. |
"Lem" wrote in message ... Will an automatic car battery charger trip out at the correct point if the battery is left connected to the car? I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! Thank you for any views. If your battery is good, it should be OK If your battery develops a short, it could blow the top of the battery off. Cheaper batteries do this sometimes, they keep sucking the amps + never charge up. If your battery voltage is less than 10.5 volts, it probably will never charge |
On Wed, 02 Feb 2005 21:49:25 -0900, Floyd L. Davidson wrote:
If the charger works correctly with the battery out of the car, it will work equally well with it in the car. The only thing left electrically connected to the battery is the clock in your radio! cough might be true for a 20 year old banger but prettty much anything younger will have the computer(s) connected, alarm etc. OK all in various states of "standby" depending on how long the car has been switched "off" but all still there. Some vehicles have a deliberate "sleep" mode so that the battery isn't flattened by all these devices before delivery or other known periods inactivity. As for the OPs question, the battery will be fine so should all the, permenantly connected electronics. Indeed disconnecting the permenant 12v may well cause more problems as the computers may "forget" their settings or reset to basic defaults. Not to mention having to reset the time on your clock and enter the anti theft code into the radio... -- Cheers Dave. pam is missing e-mail |
In article ,
Lem wrote: Will an automatic car battery charger trip out at the correct point if the battery is left connected to the car? Yes. I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! However, if a battery is always needing charged and the car charging system is ok, the battery might well be on its last legs, and never reach a high enough voltage to cut out the charger. -- *It's o.k. to laugh during sexŒ.Œ.just don't point! Dave Plowman London SW To e-mail, change noise into sound. |
"Lem" wrote in message ... Will an automatic car battery charger trip out at the correct point if the battery is left connected to the car? I don't want my charger to keep pumping current into my battery if it is fully charged in case my battery suffers some sort of damage! Thank you for any views. Lem ------------------- BACKGROUND ... A thread last September in the uk.rec.cars groups called "Need to disconnect battery before charging?" http://snipurl.com/chww seemed to generally conclude that it is alright to charge a car battery without disconnecting it first. My battery charger is rated, by the manufacturer, at 11 Amps. It is probably not 11 Amps but it is bigger than I need for my old Mazda 1400cc car. It cuts out automatically when the battery is charged and the cutout has an selector for sealed batteries and non- sealed batteries. I think (not sure) it works at no more than 14.4 volts. This is it http://snipurl.com/chwx. Is it ok to leave this charger connected until it trips out or will the trip point be delayed by the presence of the car's elctrics in the circuit? The few times I've had to charge my car battery I've done so in-situ with no problems. HOWEVER most el-cheapo car battery chargers are NOT regulated and could seriously over-charge the battery if left connected for too long (they may well taper off the current but still end up over-charging the battery). If you want to be sure, you can buy an external battery charging regulator that you connect between the charger and the battery. This not only prevents over-charging but some also have indications on them to indicate how flat the battery is and how the charge is progressing. |
In article ,
Miles wrote: HOWEVER most el-cheapo car battery chargers are NOT regulated and could seriously over-charge the battery if left connected for too long (they may well taper off the current but still end up over-charging the battery). Most el cheapo chargers are also of low output, so if charging a well discharged battery will take a long time anyway. Most would simply use an overnight charge - not leave it on for days. -- *We have enough youth, how about a fountain of Smart? Dave Plowman London SW To e-mail, change noise into sound. |
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