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4v Lead Acid

Old 05-31-2010, 08:47 AM
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hellomynameisdookie
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Default 4v Lead Acid

I don't have a 4v specific charger, so I'm closely monitoring the battery as it charges. It's a 4v 10ah battery. How many cells is this? What should the peak voltage be when fully charged?

Thank you much!
Old 05-31-2010, 09:53 AM
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Default RE: 4v Lead Acid

someone check me out on this because I know very little about pb batts.

It is 2 cells and http://www.windsun.com/Batteries/Bat...AQ.htm#Battery Voltages
Old 05-31-2010, 10:02 AM
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Default RE: 4v Lead Acid

Check the specifications for that battery:

http://www.bb-battery.com/productpages/BP/BP10-4.pdf
Old 05-31-2010, 10:46 AM
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Default RE: 4v Lead Acid

Great Information, thank you much!

Now onto another question.....what would be a cheap plug in wall charger to use for 4v lead acid batteries? All I can find are for batteries 6v and up. Even the manufacturer of the battery suggests chargers they sell, but all are for 6v and up batteries! I've searched and found nothing. Suggestions?
Old 05-31-2010, 01:14 PM
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Default RE: 4v Lead Acid

Copied from this website:

http://www.powerstream.com/SLA.htm

"Minimum voltage
Anything above 2.15 volts per cell will charge a lead acid battery, this is the voltage of the basic chemistry. However, most of the time a higher voltage is used because it forces the charging reaction at a higher rate. The voltage to avoid is the gassing voltage, which limits how high the voltage can go before undesireable chemical reactions take place. The typical charging voltage is between 2.15 volts per cell (12.9 volts for a 6 cell battery) and 2.35 volts per cell (14.1 volts for a 6 cell battery). These voltages are appropriate to apply to a fully charged battery without damage. If the battery is not charged you can use much higher voltages without damage because the charging reaction occur first."

It seems that 4.7 volts is the maximum to be applied to your two-cell battery when it is almost full.

I couldn't find a comercial 4.0 volt charger for SLA, the smallest is 6.0 volts.

This additional information may be useful for making a decision:

http://en.wikipedia.org/wiki/Battery_charger

http://www.instructables.com/answers...5-ah-sla-batt/

http://www.batteryuniversity.com/partone-13.htm
Old 05-31-2010, 04:05 PM
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Default RE: 4v Lead Acid

A fully charge Pb cell will be at 2.28 volts/cell. A 4 volt battery would be a 2 cell unit. Do not charge at more than 0.1C unless you monitor the cell temperature very closely and stop the charge as soon as you detect a heat rise. If you can set the peak voltage, you can leave it on charge indefinately without damaging the cells as long as the current is limited.

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