Trouble starting on low compression

[Tired iron]

Glad to hear! Upwards and onwards!

[Hickory]

Thats why you only had 6.4 during charge. A charger would normally put out 6.7-7.0 volts depending on the charger and the state of the battery.

[BobDeSoto]

Are you saying that a battery tender will not charge a battery?

[Hickory]

To my belief a battery tender puts out such a low amperage that it takes a long time to actually charge a battery, its main use is to keep a charge.

[Ivan_B]

Even a small amperage should charge it. My first charger/tender was only 1.5 amps... It would charge in a day or so. Unless, of course, the charger is not for a car battery and has a really low power output, in which case it will take much longer ?

[TodFitch]

6 hours ago, BobDeSoto said:

Are you saying that a battery tender will not charge a battery?

There are some “smart” chargers that won’t start to charge if the battery voltage is too low. I don’t know if the Battery Tender brand is in that category or not.

[DJ194950]

My mid sized  Battery Tender recharged my old car batteries many many time from a dead state that would not even make a starter click.  Cost about $60 most places.

 

Just do not be in a hurry,  it can take close to a whole day (overnight  usually was enough) and could also be left on for long periods where the charge output was just micro volts to hold a charge without overcharging (storage).

 

DJ

[Local2ED]

I once brought home a not running 1950 Dodge B2B pick-up.

I played around with it for 2/3 days as it was always on the verge of starting but not quite there.

Sounded like it was flooded and of course the plugs showed wet from lack of running.

The spark, to me looked ok.

Finally relented and put in a new condenser I had.

Got in, pulled choke and pressed the gas pedal, turned the key and hit the starter pedal and it started right away.

[Hickory]

Im saying that a battery tender puts out a lower ampere, and voltage. Its supposed to maintain a charge, vut yes it will charge a dead battery over a long period of time. The op stated hos charger wasnt keeping up over extended cranks. But what im curious about is has the op got the car to run or not. My 49 chrysler i got running with lower compression numbers than that. So i would think we need to work more with the fuel and spark.

[oldodge41]

He said it did start. 

"We ended up bringing the battery to O'Reillys, they tested it and said it was good. Turns out we were using a battery maintainer not a charger to charge the battery! Got a charger and charged it up overnight and got a full charge. The car started this morning for the first time! Refer to my most recent post for details. 

Edited October 29 by Cooper40"

 

All's well that ends well!

[BobDeSoto]

I have my batteries on battery tenders all the time - both 6 volt and 12 volt.