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mamun2a said:u talk a lot but got know sol.
as far i know from AAA bat recommends, dats charge it with same v and 1/10 of the current. but u all are far away from there
though i also know nothing about it...
hi,watzmann said:please check these link ,i have found a charger and the supplier can send it to me with a good shipping cost.
before ordering it i decided to post you the link and you tell me if it's a good one or not.
my battery is 12 Volt 7AH.....i know it may take much time to charge but tell me if i did a bad selection.
https://www.master-instruments.com.au/products/57804/BFJ012.html
mvs sarma said:you might have had a charger already in the equipment for which you purchased this battery.
you may set up any power supply above 15 volts, that is capable to deliver the required load.
Use a LM317 ina constant current mode set for the rate of charge as prescribed by the battery manufacturer , then you may maintain the charging hours manually.
Mean time you have to watch if the battery is overheated where you can controll the current as per makers specs.
Sorry Agreedericgibbs said:Morning Sarma,
Its a SLA sealed lead acid, constant voltage charger.![]()
If you charge over 14.8/15v you will damage the battery.
watzmann said:something else i need to know : i'll connect the Vin of the LM317 to a power supply output 40 Voltage and 0.9A
in this case will the LM317 be able to supply at the Vout 1.5A as they tell in the datasheet ?
watzmann so you mean i can build my charger by adjusting the current to 14.5 using the LM317 ...... i looked at the datasheet it has a constant currant 1.5A
but are you sure that this will not damage my battery?
secondly , how can i know that my battery is fully charged ? ......
i know that i have to check the battery voltage but should be the voltage equal 13 or just 12 ?
watzmann said:look at this link , i like this circuit and i think it well designed
**broken link removed**
But be sure to disconnect it. Floating at 14.6 will dry it out prematurely. When it reaches full charge (14.6), you can reduce it to 13.4-13.6 and leave it floating.Your Battery will be Fully Charge When it reaches 14.6 Volts.
watzmann said:and how to reduce it again to 13.6 after reaching 14.6 ....... do you mean using the LM317 circuit
watzmann said:i have a found a 12 volt battery charger in the market and supply 3000mA.
my battery is 12 volt 7Ah....and the merchan recommend to use charger current up 2.1 A.
do you think this 3000mA will damage my battery?