On Sun, 07 Jun 2009 21:31:56 +0100, Eddie wrote:

On 7 Jun 2009 20:50, wrote:


"Eddie" wrote in message
...
My car battery is oversized for the car. The battery is a
bit old but usually works fine. The battery is flat (I left
the lights on).

My fancy new modern charger senses a poor battery and only
puts in very little charge.

I used to use a really old charger to charge this battery
successfully. I opened up the old charger and saw it was
only a transformer and a big rectifier. That's it. No
soothing.

Is this ok for a car battery or is it way too crude?

Check the electrolyte level in your battery.Filtered DC causes
polarization of the battery.

Bob


It's a sealed battery. Are they better or worse than electrolyte
batteries when the charge drops to very low?

Similar, the difference is when they're overcharged , but any battery with
a high CCA compared to it's capacity won't like being hard discharged.
Boost it for a few hours on the old charger, charge it up on a decent one
or by driving the car & see if it's still happy.