Sorry I dont have a clear cut answer, but here is my
view on charging and batts and maybe it will help:
All batteries are just trying to contain a chemical
reaction inwhich both sides, the anode and the
cathode, want to reach neutral. This chemical
reaction is controlled by the rate of electrical
discharge and the batteries' internal resistance.
When we charge, we are using electrolysis to reverse
the neutral state which is why the charge voltage must
be higher than the original 12V. With electrolysis
there will be loss of material because not everything
transfers back over to exactly as it was before
discharge. Some of the material will remain on the
one side unable to transfer back over due to higher
resistance, or lost during gassing. In addition, any
material that transfers back to the original side will
layer ontop of the highest conductive point. This
means the original structure of the anode or cathode
has become pitted or brittle, as well as brittle from
heat. This brittleness can also be seen when fast
charging (hi amps) because only the most conductive
and highest point are going to get the material. If
charging slowly (low amps), more material is able to
transfer back to the other side evenly, filling all
the gaps or holes.
The life of the batteries is dependant on how well the
structure of the anode and the cathode (both
chemically and physically) remain as close to original
as possible. High discharge and fast charging dont
help in this respect. Moderate discharge and slow
charging will preserve batteries.
But the reality is, who wants to drive slow or wait
forever on a slow chrage? That's why when charging, a
combination of the two (fast and slow) is used which
affects the life of the battery. So it will be up to
each guy to figure out how long to charge for fast and
then slow for the type of batteries he is using Which
means battery life will vary from person to person.
--- Andrew Wowk wrote:
> Does anyone know exactly how battery life may be
> shorted with fast charging,
> provided the charge voltage is tempreature
> compensated? My B&B batteries
> have a max charging rate spec of .3CA whichseems to
> be pretty universal for
> most Chinese AGMs. I would like to charge them
> faster on an as-needed bases,
> but I'm wondering if this is a bad idea. It seems
> like I could charge faster
> in the bulk phase without too much damage to them.
>
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