Very simple battery voltage question (with picture)

Other Hardware General Electronics
1

I have this 6v, 5Ah SLA battery. It has two main pieces of info on the label:

Standby Voltage: 6.75v - 6.90v
Cycle Voltage: 7.20v - 7.25v

My question is, can I set my Arduino based charger to 6.80 volts without fear of over-charging? (there is no current limiting on my charger)

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2

arrakark:
My question is, can I set my Arduino based charger to 6.80 volts without fear of over-charging? (there is no current limiting on my charger)

That sounds right, but - though it is relatively unlikely to be a problem - you probably should provide some current limiting facility however.

A very simple one is a 6V 6W light bulb. Many "float" chargers used that.

3

Thank you for your confirmation. My charger is only capable of providing 300mA max, so I guess that's current limiting enough.

The charger does have a voltmeter and a cutoff function. I tried charging at 7.20 volts and cutting it off at 6.4 (I believe that is the 100% charged voltage) but the battery would linger a bit, then drop back down below 6.4 volts.

A very simple one is a 6V 6W light bulb. Many "float" chargers used that.

Are you referring to 6v head lanterns or those bulky flashlights? :slight_smile:

4

There is a lot of information about charging all types of batteries at batteryuniversity

5

Thanks for your reply. I found that the battery I had was actually made by Panasonic and had a part number LC-RB064P2. I found manuals on the internet like this one (4.0Ah, same size): http://pdf.datasheetarchive.com/indexerfiles/Datasheets-SL1/DSASL0011492.pdf

They show that you can keep the battery at 6.80v to 6.90v at all times (that's 100% charge), but if you use it a bit it will drop down to 6.40 volts, then discharge to 5.40 volts which is 0%. Not recommended to discharge below 50% with is about 6.00 volts.