On 16 Jun, 22:40, "Dave Plowman (News)" wrote:
In article .com,
wrote:

SLAs have different charging requirement to non-gel cells. They should
not be charged with a car or bike charger. Charging v should be
significantly lower.

Assuming a reasonably large battery and a normal sort of domestic charger,

from the pic it looks like a typical small SLA. A standard car battery
charger will charge it, but far too fast, so it wont last well. If
youre thinking more of a NiCd charger, that would be ok, if extremely
slow.

the internal impedance of the battery will prevent the voltage rising too
high to damage an SLA until it is near fully charged.

Are you sure thats what you meant? Internal R is typically a fraction
of an ohm, which will have more or less no effect on charging, and
especially so when full and charge i is at a minimum.


Of course the
correct charger should be used, but other methods can be devised for a
cheap and cheerful solution as it would appear is needed.

sure. the simplest of which is a wallwart.

Or how bout what they recommended in one of my old books, putting the
battery across the mains light switch contacts, so its in series with
the bulb. Would work on dc mains, until you operate the switch...
Would desulphate it too. Good idea?


NT