does square wave/60hz adaptor can do harm for charging 12Vsla battery?

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mamun2a

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I collect a Laptop charger of 12V 1.2 Amp output, it lights a incandescent bulb with blinking [may be for hz or square wave i think]. can i use it to charge my 12V 7.2AH SLA battery?

thanks

mamun2a
dhaka, BD
 
Probably. Hook it up and measure the current. If current is flowing into the battery and the battery voltage is rising, it is charging.
 
mamun2a said:
I collect a Laptop charger of 12V 1.2 Amp output, it lights a incandescent bulb with blinking [may be for hz or square wave i think]. can i use it to charge my 12V 7.2AH SLA battery?

thanks

mamun2a
dhaka, BD
Click to expand...

hi,
If the charger is 'fixed' at 12Voutput it will not charge a 12V SLA fully, you require a voltage of 13.8V to 14V to fully charge a 12V battery.

The blinking of the lamp/bulb maybe caused by the lamp trying to draw to much current from the 12V power supply and it keeps shutting down.
 
thanks for your suggestion.

but i the Battery level said charge with 12V and 1/10 of the ampere. why they said this?
 
mamun2a said:
thanks for your suggestion.

but i the Battery level said charge with 12V and 1/10 of the ampere. why they said this?
Click to expand...

hi,
Please post the battery model number or datasheet.

From that 1/10 AHr rate description it does not sound as though its an SLA battery.???
 
bychon said:
Probably. Hook it up and measure the current. If current is flowing into the battery and the battery voltage is rising, it is charging.
Click to expand...

i know [may be wrong] that SLA or any battery just down its ampere, voltage is stable. if so then does volt rising is visible?
 
ericgibbs said:
hi,
Please post the battery model number or datasheet.

From that 1/10 AHr rate description it does not sound as though its an SLA battery.???
Click to expand...

its not near to me now, i'll bring it 2morow. 1/10 amp of its said ampere, i c it on almost every rechargeable battery
 
mamun2a said:
its not near to me now, i'll bring it 2morow. 1/10 amp of its said ampere, i c it on almost every rechargeable battery
Click to expand...

A recharge rate stated in C/10 ie; 0.1 of AHr capacity is not usually for a Sealed Lead Acid [SLA] battery.

DONT try to recharge until you are sure of the battery type, it could be hazardous.!
 
ericgibbs said:
A recharge rate stated in C/10 ie; 0.1 of AHr capacity is not usually for a Sealed Lead Acid [SLA] battery.

DONT try to recharge until you are sure of the battery type, it could be hazardous.!
Click to expand...

my charger is of 1.2A, and the battery is 7.2AH
 
mamun2a said:
my charger is of 1.2A, and the battery is 7.2AH
Click to expand...

hi,
There is no point in guessing the battery type.

You have said: SLA and C/10 in your posts, which leaves a doubt in knowing the actual battery type.

I would advise that you confirm the battery type, if possible post a battery model number or photo of the battery.
 
sorry i am late.

this is not the talkin 1 but same. it is UPS battery.
**broken link removed**
 
Last edited:
mamun2a said:
sorry i am late.

this is not the talkin 1 but same. it is UPS battery.
Click to expand...

hi,
Thats an SLA. Thanks for the pic.

To charge a 12V SLA for 'float' use, a maximum charge voltage of 13.8V is recommended, for 'cyclic' [heavy use] a maximum charge voltage of 14V is recommended.
The minimum voltage of the battery should never be allowed to fall below 10.8V.

The 12Vdc power supply you have, if its fixed at 12Vdc, it will not fully charge the 12V battery.
 
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hmm, that case i miss the option the same adaptor has 15V also, but i avoid that bcoz of 3 volt extra. and in my local i can found Multi volt adaptor of 12V 1A, so it also not perfect.

then i have another option. i ve a UPS of Apollo Brand, from that i may dig out a port for charging this battery. does it OK, Sir?
 

hi,
If you have two 3amp diodes, you drop approx 1.4V across the diodes, so at the battery you would have approx 15V - 1.4V = 13.6V
 
? about "then i have another option. i ve a UPS of Apollo Brand, from that i may dig out a port for charging this battery"
 
hmm..
**broken link removed**

i have 1200VA one, it has 2 battery. i wish to make an extension cable for the extra battery charging.

as per picture i've middle of these**broken link removed**
 
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