Battery Problem?

[Rick62]

The battery in my ML350 is only a couple of months old. This morning it was completely dead. When I hook up my 6amp charger the needle spikes to full charge for a few seconds then drops to zero. Every few seconds it repeats. Bad battery?

 

[Darter6]

Sounds like it. When the charger does that it may be a internal short.Had the same problem with the wife's Honda.Battery less than a year old.
Hook up the charger it would charge and then go to float. Next day dead.Redo and disconnect from car thinking it was a drain.Dead again. Try again charge to full then wait a few hours and load test it.If it will charge at all.
Let us know what you find.

 

[Geoff 2]

Interior light left on?

 

[Rick62]

The battery being dead is not the problem. The problem is the battery won't take a charge.

 

[Darter6]

The problem is the battery won't take a charge.

It must be a battery internal short or something to that fact.

 

[toolmanmike]

The battery in my ML350 is only a couple of months old. This morning it was completely dead. When I hook up my 6amp charger the needle spikes to full charge for a few seconds then drops to zero. Every few seconds it repeats. Bad battery?

Battery voltage? Load test results?

 

[Dave6T4]

Without any warning, my 1967 R/T would not start one day. Not even with jumper cables. I checked each cell with a hygrometer, and they were all fully charged. I figured one of the the posts had broken internally.

 

[toolmanmike]

Without any warning, my 1967 R/T would not start one day. Not even with jumper cables. I checked each cell with a hygrometer, and they were all fully charged. I figured one of the the posts had broken internally.

Probably so. A post to post voltage test could help there. 12v+ and you are good. Less than 12 either an open inside or discharged.

 

[1967coronet]

I have noticed over the past 15 or so years that batteries go fast when they expire.
Older cars and batteries would warn you awhile, crank slow , need a jump off and on then finally that was it.
Our 16 Impala had the dash gauges go nuts for a few seconds , next morning dead battery, 200 amp boost would not crank it.
New battery and all was good.

 

[Rick62]

Battery voltage? Load test results?

Battery voltage is 6.1 I don't have a way to do a load test.

 

[Black_Sheep]

Battery voltage is 6.1 I don't have a way to do a load test.

Just put a voltmeter on the battery and crank it over, if it drops like a rock the battery is bad…