what exact volt n amp need to charge - Electronic Circuits Projects Diagrams Free

mamun2a · 27th December 2006, 08:48 AM

what exact volt n amp need to charge a 6 v 4A or 12 V 5 A battery.

dknguyen · 27th December 2006, 08:50 AM

Depends on the battery type doesn't it?

mamun2a · 27th December 2006, 08:51 AM

who knows

?

dknguyen · 27th December 2006, 09:11 AM

I'm not sure why you keep putting the smiley faces, but I'm a bitter person and it's starting to piss me off when I see toothed smileys where they don't belong.

I'm saying right now, it depends on the type of battery.

mamun2a · 27th December 2006, 10:16 AM

lead acid or motor bikes battery:~

audioguru · 27th December 2006, 03:05 PM

Have you ever seen a 6V or 12V Ni-Cad or Ni-MH or Li-Ion battery???

Ayne · 27th December 2006, 03:37 PM

Quote:

Have you ever seen a 6V or 12V Ni-Cad or Ni-MH or Li-Ion battery???

Yes, i saw when i was sleeping. I see it(6V Ni-Cad) in my dream, it was connected with Cellular mobile. Mobile dimension was (Length=12, width=1.2 hight=1) in inches

dknguyen · 27th December 2006, 07:37 PM

If it's lead acid it shouldn't be overly fussy about the current you put into it (ie. it won't explode like a Lithium battery as long as the current is within reasonable limits). If you google you can probably find some rough numbers. I would be more concerned with knowing when to stop the charge.

mamun2a · 28th December 2006, 04:31 AM

i said car or motor bike battery also u funny guys...

mamun2a · 28th December 2006, 04:37 AM

i said car or motor bike battery also u funny guys...

Aily Sajjad · 28th December 2006, 06:49 AM

Any equivalent or higher voltage will charge the battery.
And .. Keep smiling but be serious...

Aily

mamun2a · 29th December 2006, 06:13 AM

Aily, i'm charging my 12 v 5+ Amp Exide motor bike battery with 12 V 300 ma adaptor, about 24 hour is it right?
as far i know the professinal charging stores uses a large size charger and they charge batt 6 V to 24 V within 2-4 hour, what they do?

as from ni-cad's body instruction i know a batt to charged with its 1/10 of current and exact volt, but is it applicaple for car battery???

~~!!!???

((

dknguyen · 29th December 2006, 06:23 AM

Car batteries are lead-acid so they are less fussy than NiCds. It means that you can follow the NiCd rules and nothing bad will happen (but you could probably increase the current if you wanted to).

Aily Sajjad · 29th December 2006, 11:19 AM

Yeah,

What happens when you start charging is : Initially there is a large current as the voltage of battery is low. As the battery gets graually charged, the battery voltage (which opposes the charging voltage) increases and thus the charging current decreases. Battery Chargers are basically current regulators which provide constant charging current to battery and provide security such as over-charging protection etc.

Just keep an eye on the adapter. If it heats up when you start charging, you will have to use some more powerfull adapter. But i dont think it will be like that. So you can go ahead with what you have.

Aily

JTECH · 29th December 2006, 08:58 PM

For lead-acid, you can't go wrong if you use standard LM338T or LM338K as in the application notes for linear voltage regulator (just heatsink the 338 properly). Pre-set the voltage for between 13.8V and 14.5V (typically 14.2V). The LM 338 is a 5A (guaranteed) device with built-in current limit. You'll need a DC voltage which is at least higher than 14.5V + 1.25V as an input into the regulator. This means about 16VDC or higher.

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27th December 2006, 08:48 AM	(permalink)
mamun2a	what exact volt n amp need to charge what exact volt n amp need to charge a 6 v 4A or 12 V 5 A battery. __________________ 'if u cant beat him then join him' I always say...

27th December 2006, 08:50 AM	(permalink)
dknguyen	Depends on the battery type doesn't it?

27th December 2006, 08:51 AM	(permalink)
mamun2a	who knows ? __________________ 'if u cant beat him then join him' I always say...

27th December 2006, 09:11 AM	(permalink)
dknguyen	I'm not sure why you keep putting the smiley faces, but I'm a bitter person and it's starting to piss me off when I see toothed smileys where they don't belong. I'm saying right now, it depends on the type of battery. Last edited by dknguyen; 27th December 2006 at 09:18 AM.

27th December 2006, 10:16 AM	(permalink)
mamun2a	lead acid or motor bikes battery:~ __________________ 'if u cant beat him then join him' I always say...

27th December 2006, 03:05 PM	(permalink)
audioguru	Have you ever seen a 6V or 12V Ni-Cad or Ni-MH or Li-Ion battery??? __________________ Uncle $crooge

27th December 2006, 07:37 PM	(permalink)
dknguyen	If it's lead acid it shouldn't be overly fussy about the current you put into it (ie. it won't explode like a Lithium battery as long as the current is within reasonable limits). If you google you can probably find some rough numbers. I would be more concerned with knowing when to stop the charge.

28th December 2006, 04:31 AM	(permalink)
mamun2a	i said car or motor bike battery also u funny guys... __________________ 'if u cant beat him then join him' I always say...

28th December 2006, 04:37 AM	(permalink)
mamun2a	i said car or motor bike battery also u funny guys... __________________ 'if u cant beat him then join him' I always say...

28th December 2006, 06:49 AM	(permalink)
Aily Sajjad	Any equivalent or higher voltage will charge the battery. And .. Keep smiling but be serious... Aily

29th December 2006, 06:13 AM	(permalink)
mamun2a	Aily, i'm charging my 12 v 5+ Amp Exide motor bike battery with 12 V 300 ma adaptor, about 24 hour is it right? as far i know the professinal charging stores uses a large size charger and they charge batt 6 V to 24 V within 2-4 hour, what they do? as from ni-cad's body instruction i know a batt to charged with its 1/10 of current and exact volt, but is it applicaple for car battery??? ~~!!!???(( __________________ 'if u cant beat him then join him' I always say...

29th December 2006, 06:23 AM	(permalink)
dknguyen	Car batteries are lead-acid so they are less fussy than NiCds. It means that you can follow the NiCd rules and nothing bad will happen (but you could probably increase the current if you wanted to).

29th December 2006, 11:19 AM	(permalink)
Aily Sajjad	Yeah, What happens when you start charging is : Initially there is a large current as the voltage of battery is low. As the battery gets graually charged, the battery voltage (which opposes the charging voltage) increases and thus the charging current decreases. Battery Chargers are basically current regulators which provide constant charging current to battery and provide security such as over-charging protection etc. Just keep an eye on the adapter. If it heats up when you start charging, you will have to use some more powerfull adapter. But i dont think it will be like that. So you can go ahead with what you have. Aily

29th December 2006, 08:58 PM	(permalink)
JTECH	For lead-acid, you can't go wrong if you use standard LM338T or LM338K as in the application notes for linear voltage regulator (just heatsink the 338 properly). Pre-set the voltage for between 13.8V and 14.5V (typically 14.2V). The LM 338 is a 5A (guaranteed) device with built-in current limit. You'll need a DC voltage which is at least higher than 14.5V + 1.25V as an input into the regulator. This means about 16VDC or higher.