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My battery needs to be replaced. The current battery is a 12 volt 7 amp and I have a new battery that is the exact same dimensions but it is a 12 volt 8 amp. Can I use it?

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Yes, the 1 extra amp will not make a difference. The 8 amp will actually last just a little longer before it runs out of power.

Posted on Apr 23, 2015


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Okay, I'm working on a scooter for my nephew that originally came with (2) 12 volt 12Ah batteries minus the charger. and I know I need to replace them with (2) batteries of the same 12 volts and lets

not exact, to charge apropiate needs 10% more than nominal voltage. if not, will not charge the batteries.
And the charger its very important because you can over charge the battery.An example,if you have a 12 Amps Batteries each one if you put it in series will be 24 parallel conection will be 12 volts but the double of Amps.
At serial connection will be 12 Volts the amps will be the same but the volts will be 24.

The charger at 12 Volts must be 13.8-14.5 DC Volts and divide the Amps in Hours.
The charger at 24 Volts must be 26-28 Volts. to charge well.

The charger for 12 amps batt example must charge 2 amps per hour at 6 hours = 12 Amps.(2 Amps Charger by 6 Hours Charging= 12 Amps.(Fully Charged.
3 Amperes Charger needs 4 Hours to charge 12 amps Batt.
5 Amperes Charger needs 2 Hours charging an a quarter
All of this is at DC Current.


Oct 18, 2014 | UPG 12V 12Ah Electra Scoot-N-Go 88615...

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I am installinga 4548 inverter. At 4500 watts, it puts out approximately 20 amp per phase. My generater that will feed the charging current for the batteries will put outapproximately 28 amps. Is the...

Let just wait a minute. You have an inverter that is rated at 4500 watts. This spooky. The inverter has a three phase input/three phase output? What is the inverter going to be used for?

Next question. What type of batteries are you using and what is the voltage/current in series or parallel? What will be the total voltage you will producing with the batteries? What is the total current of the batteries.

Another question? What is the voltage of the 28 amps? If it going to dump 28 amps across some batteries that rated at 12 volts and 1400 amp/hrs. For 12 volt batteries with a total of 1400 amps. What you will need approx 14 to 14 1/2 DC and with 28 amps across the batteries for charging these batteries. The batteries will be gone in about 1 hour. Boil all the water out of them. When a battery starts to boil it release water with hydrogen gas (the gas is very explosive and dangerous).

You also don't have a regulation circuit to limit the amount of current depending on the needs of the batteries. Also, you don't have a trickle charger to keep the batteries fully charge when the batteries are idle.

You will also need DC regulated charger that will keep the voltage 2-4 volts above you battery voltage. Without this voltage above the batteries voltage it will not charge those batters. Batteries need to forced to except a charge that why voltage above the source voltage. If you can check the voltage on your car/truck with a 12 volt system. While engine is running the voltage across the battery will be 13.8 to 14.1 volts. Now, the current limiter is the alternator it has a regulator built into it for stabiizing voltage and current went the batteries require more current but it limited by alternator regulator
Now, to get more current out of the alternator the regulator will supply dc voltage to the stator of the alternator generator more current. More dc voltage is supplied by the regulator but the dc voltages is limit to about 24 volts. Another limiting factor is the alternator copper windings diameter---larger diameter more current, small diameter less current. Utilities systems use big mega watts generators. The maxi um dc voltage for these three phase generator would like 500 to 800dc volts for peak to peak output. There is a simpler way of doing this.

You need to rethink everything here. Also, I can help you if you supply the needed information.
I truly wish you luck in your electrical endeavors. GB you. stewbison

Aug 22, 2011 | Refrigerators

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I have a 14 volt source but when I try the winch in either forward or reverse the voltage drops to 4 volts. The drum is not seized because you can pull the cable out easily by hand.

Not only do you need a 12 volt supply (13.8V) to operate this winch, but you also need a.) wire large enough to carry the electrical load, and b.) a power source that has the necessary current (amps) to turn the motor.

If you have wires that are too small, they will heat up and not be able to deliver the current (amps) required by the motor. If your power source is to small - it can not supply the current required. The result of either conditions is "voltage drop". This can be explained the same way your car needs a 12 volt car battery to start. If that car battery was dead, you couldn't connect eight "D" cell batteries (8 x 1.5volts = 12 volts) together and attach to the car's battery cables and expect it to start. This is because the amount of current available in the car battery is hundreds of time greater than eight "D" cell batteries - even though when the D cells are connected in series - both systems deliver 12 volts.

If neither of the above conditions is present, then there could be an electrical problem with the drive motor itself. This could be a shorted / melted winding or other electrical connection that is not right, even if the drum spins freely.

Apr 04, 2011 | Electric Superwinch LP8500 Series Utility...

2 Answers

I have a Vector 2,000,000 Power Series Spotlight and I need a new battery. The current battery is SEL sealed lead- acid. The number is DMU 3-12 12v 3AH. I have been unable to find this battery...

There is good news and bad news concerning a replacement battery for this particular model light.
The good news is that a suitable, but not exact, replacement will be available at Battery Mart on November 30, 2010.
The bad news is that it cost $29.95.

I purchased about a dozen of these lights in 2006 and have had them in storage since. No one can or will be more unhappy than I should all of them need new batteries.

Sep 07, 2010 | Vector 2M Pwr Rch Spotlight

2 Answers

Typ of battery

Mine has 2 12 volt 12 ah agm batteries model ub12120 if that helps>

Jul 12, 2010 | Pride Mobility Products Go Go Ultra X 3...

1 Answer

How do i know what size power wire to use in my car for my new radio i plan to hook up two 1200 watt amps an equalizer and a 15 in subwoofer to a 2007 chevy cobalt

Put a generator in the trunk. I am assuming this is RMS watts. This will require modification to the vehicle's electrical system. Lets look at what you are saying. You are going to use two 1200 watt amplifiers, for a total of 2400 RMS watts.

Using a simple rule of thumb based on ohm's law and assuming a little over 80% efficiency in the amps (I doubt it) you divide the total watts by 10 (the cars 12 volts – a fuge), that leaves you a value of 240 or 240 amps required to power the amps at 12 volts DC.

Now consider 20 feet of wire to the battery or forty feet of wire round trip, one for positive and one for negative. a #2 AGW wire, about the size of your finger, will give you a 1.8 volt drop or 7% voltage drop in the wire. Assuming the alternator is maintaining 13.8 (standard charging voltage) that leaves you exactly 12V at the amplifier. This sounds great but the larger alternators only put out about 100 amps so you need 2.4 alternators to supply the current the amps will need. Lets assume a standard car battery is rated at 50 amp hours, that indicates that the battery can supply about 12 minutes of power at full output. Now calculate the rest of the power requirements of the vehicle and what you are short in alternator capacity the battery makes up. I would guess you vehicle battery would be dead in less then ½ hour or you need to keep the volume way down. That indicates a much smaller amp would be a much more cost effective solution.
Good Luck,

Dec 01, 2009 | Pioneer Car Audio & Video

3 Answers

Can I use a 5 amp 240v AC domestic fuse to replace 5 amp 12v fuse

A fuse is rated for it's current carrying capacity so yes you can use a 240 volt 5 Amp fuse in a 12 Volt circuit.
The Voltage is given to indicate the insulation of the fuse, i.e. if you used a 12 volt fuse in a 240 Volt circuit it may arc and therefore is not suitable. You can always use a fuse with a higher voltage rating in a lower voltage rated circuit.
A 5 Amp fuse will carry 5 Amps indefinately and will only blow at 2 or three times it's rated current.

Oct 26, 2009 | Max American Terminal 30 i Fuses

2 Answers

2002 monte carlo will not charge has a new battery and a new alternator has 12 volts going to the big post and 12 volt going to 1 of the 2 small wires

You need more than 12 volts to charge the battery. How many amps does the alternator put out? This is what charges the battery.

Aug 18, 2009 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

Blue amp light lights for 2sec

There may be more than one problem. The fact that the radio AND the amp are seeing a voltage of 7v indicates that the battery is weak or there is a bad connection somewhere in the power line.

It's also possible that the amp is defective (shorted output transistors?) and when it turns on, it's drawing excessive current. That would cause the voltage to drop more than normal. If the amp is drawing excessive current AND there is a bad connection in the power line, the amp may begin to blow fuses (depending on the reaction time of the protection circuit) when you repair the power line problem.

Apr 25, 2008 | Sony XM-1252GTR Car Audio Amplifier

1 Answer

Charger for 12 volts 7 amp battery smf

you need to go to a **** smith store and bye a kit to do this cheers peter

Apr 18, 2008 | Ryobi Multi-Volt Battery Charger

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