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EASY- Charge Sealed lead acid battery with benchtop power supply

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spitso

Member
Hi there

Before i leave for work i would like to put my sealed lead acid battery on charge using my variable benchtop power supply. Battery is lw650c 6v valve regulated dosent state amp hours just intial current which is 2.9 amps.

Ill be back in 5 hours. How many volts should i set my benchtop power supply to? how many amps should i let through? and correct me if im wrong but positive terminal of power supply goes to positive of battery and negative to negative, correct?

thankyou
 

MikeMl

Well-Known Member
Most Helpful Member
Short the power supply leads; set the current limit to 2.9A.
Unshort the leads, set the voltage limit to 7.35V (2.45Vpc)
Connect + to +; - to -

If the supply current is >100mA after 5 hours, then let it charge longer. Do not leave the battery connected for more than 24hours.

If you want to "float" the battery indefinetely, set the voltage to 6.85V (2.28Vpc)
 
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spitso

Member
thanks for the help.

also is there a way of chraging li-ion batterys with benchtop power supply???
its 12v amps? contains 2 batterys in parrael in sereies with 2 batterys in parrael in sereies with another 2 batterys in parrael.

its the laptop battery which i took apart to get the battery module out for high amp purposes and now laptop cant charge it ( i think cause sensor broke), i can acces the - and + bypassing the sensing circuit.
 

MikeMl

Well-Known Member
Most Helpful Member
I am not familiar with LiOn battery chemistry. Google "charging LiOn" and see what is required. The charging algorithm will be stated in terms of "X Volts for Y time" or "X Amps for Y time or until voltage is Z" etc. You can always accomplish this by turning knobs on your power supply while sitting in front of it. There may not be one setting of both voltage limit and current limit on your supply that allows charging a LiOn battery unattended without abusing it.
 

Hero999

Banned
Li-on is similar to lead acid, apart from having different cell voltages, the main difference is you can't float charge them indefinitely.

Limit the current to 0.5C, charge to 4.2V/c, cut-off the power when the current drops below about 0.05C.

C is the capacity in amp/hours /c means per cell.
 
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