"mark krawczuk" wrote in message
...
hi, is there a way to work out the charging current for small capacity sla
batteries 12 volt 1.2 ah and 6 v 4.2 ah ?

it doesnt have to charge quickly . and can accidently be left on..?

mark k


As part of the procedure for desulphating SLAs, Yuasa suggest current
limiting to 1/3 the Ah rating, but this would be too high for long term
float charging.

Microcontroller based maintenance chargers like the Optimate 4 do a
controlled normal charge then back off to voltage controlled float charging
at about 13.6V - apparently this is the optimum level to avoid electrolyte
loss from gassing.

Apparently some Honda motorcycle spares stockists sell Honda branded 6-12V
switcheable microcontroller based chargers.

Some of the budget goods stores (like Lidl in the UK) do cheaper less
sophisticated microcontrolled chargers - you can leave them soak charging,
but if there's a power outage you have to reset them.

Lidl have the chargers in every few months - there's also Aldi and Netto
stores probably do something similar.