Battery charge time formula

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6 VOLT 4.5AMP HOUR RECHARGEABLE SLA 4.5AH SEALED BATTERY


If I use a 500 Mah charger to charge it, is there a formula to determine the charge time based on the starting voltage ?

Thanks gentlemen and scholars.

Andy

[dedndave]

the first problem you'll run into is that each manufacturer has a different set of specs
batteries are really a science, all their own - especially rechargables

the best charging systems employ a diode built into the battery
it is used to measure the tempurature of the battery
(with a small forward bias, a diode Vf provides a very linear indication of tempurature)
the charger then has another diode to measure room temp
it stops charging when the battery temp reaches a certain level above room temp