Do you want to know the polarity of which way you charge it?
Or do you want to know At what voltage to charge it.
OR do you want to know with what to charge it.
For the second,If there are 2 Lead acid batteries(that are 12V of course) Charge it at 24V
For the third,You can Use a Computer power supply to Charge it,they Output 24V With 2 Cables at a few Amps,I recommend you put a 1-5 Amp fuse In series with the PSU and the Scooter when you do so.
And for the first,The red Means Positive and black Means negative.
Usually,Colour is Positive,Like red,Or yellow
And Black,White,and sometimes Green is Negative,Though Green most of the time Means Ground
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thank you for your answer =)the polarity is not the problem.i needed to know the voltage and amps and with what to charge it. thought it might not be 24V @ about 2 amps (thats what i was going for in the begining) since the cable coming from the charger jack goes through the motor controller and i thought that this could change something. never know with chinese mass products. i just want to make sure ;)the computer psu is a great idea. is it safe though to charge a lead acid battery with it?the guy at the electronics store meant it must a lead acid charger. whats the difference?is it the recommended fuse?sorry when i ask questions that seem stupid but i'm pretty new to this topic and i'm trying to teach myself "learning by doing" and help is always welcome.
Nothing is too special About charging Lead acid batteries,When they tell you that they want you to Buy their charger But Really Any supply of Electricity At 11-15V will Charge a Single SLA,And the fuse if just a safetey feature just in case if there is a short,though the PSU has a built in Self-resetting fuse most of the time
Also,The more amps you charge it at,the faster it will charge,But dont Go higher than 4 Amps Unless if you are charging a big battery(Car battery,About 30 Amps or more)
Most of the time The ones in scooters are 7-9 Amp hour Batteries,You can charge them at 100 Miliamps But it Sure would take a massive amount of time to do so,2 Amps is the Maximum Charging current you should charge them at,If your charger Is 1 Amp its OK,But if it is more than a few amps you got to do something,Sometimes you can put a few cristmas lights in series with the battery and the charger to Lower it down.
the maximum is a 1/4 of the battery's capacity for 6hours.
What do you mean by 13.8to15v?
that is the charge voltage.
Argh...11V to 15V...
Umm, are you sure about that? I've been learning on the fly, having 2 vehicles recently experiencing dying batteries. And from what I've read and seem to be experiencing, it seems like you need at least 13.8V-14.4V to fully charge a 12V lead acid battery. A resting voltage of 12.0 is where it's totally flat, if I'm not mistaken.
Yes,Lead acid batteries Tolerate Those voltages,From at least 11 Volts to About 14 But not much higher than 14V
Also,You can determine how charged up a SLA is by its voltage,12V is a fairly dying battery,They should range from 12.8 to 15 volts
There doesn't seem to be any one comprehensive source of information that I can find. But what I have pieced together and discovered from my own experience (with both a brand new and a couple older 12V batteries), there seems to be THREE key voltages to look at, when it comes to lead acid batteries.
Resting no load voltage: 12.0 - 12.8V
Voltage under load: 11.4-12.3V
Charging voltage 13.8V-15+V... with 14.4V being pretty common. The main thing is to not exceed about 1/10 C while charging.
A 12V lead acid battery doesn't give a great indication of its charge from resting voltage... I.E., it will be somewhere between 12.0 and 12.8 at rest, but even at 12.8 that doesn't mean it's fully charged.
Connecting a lead acid battery to 12.8V and leaving it there forever and a day will absolutely not charge it.
Connecting it to 13.8V will eventually fully charge it, and in addition, it can be left there without damage. Even though when it's disconnected, the voltage will quickly drop down to 12.8V.
You'l be Pretty darn surprised,like me,I fully charged an SLA with 11V,"The principle of the lead acid cell can be demonstrated with simple sheet lead plates for the two electrodes. However such a construction would only produce around an amp for roughly postcard sized plates, and it would not produce such a current for more than a few minutes.
Gaston Planté realised that a plate construction was required that gave a much larger effective surface area. Planté's method of producing the plates has been largely unchanged and is still used in stationary applications.
The Faure pasted-plate construction is typical of automotive batteries. Each plate consists of a rectangular lead grid alloyed with antimony or calcium to improve the mechanical characteristics. The holes of the grid are filled with a mixture of red lead and 33% dilute sulphuric acid. (Different manufacturers have modified the mixture). The paste is pressed into the holes in the plates which are slightly tapered on both sides to assist in retention of the paste. This porous paste allows the acid to react with the lead inside the plate, increasing the surface area many fold. At this stage the positive and negative plates are similar, however expanders and additives vary their internal chemistry to assist in operation when in use. Once dry, the plates are then stacked together with suitable separators and inserted in the battery container. An odd number of plates is usually used, with one more negative plate than positive. Each alternate plate is connected together. After the acid has been added to the cell, the cell is given its first forming charge. The positive plates gradually turn the chocolate brown colour of lead dioxide, and the negative turn the slate gray of 'spongy' lead. Such a cell is ready to be used. Modern manufacturing methods invariably produce the positive and negative plates ready formed, so that it is only necessary to add the sulphuric acid and the battery is ready for use.
One of the problems with the plates is that the plates increase in size as the active material absorbs sulfate from the acid during discharge, and decrease as they give up the sulfate during charging. This causes the plates to gradually shed the paste during their life. It is important that there is plenty of room underneath the plates to catch this shed material. If this material reaches the plates a shorted cell will occur.
The paste material used to make battery plates also contains carbon black, blanc fixe (barium sulfate) and lignosulfonate. The blanc fixe acts as a seed crystal for the lead to lead sulfate reaction. The blanc fixe must be fully dispersed in the paste in order for it to be effective. The lignosulfonate prevents the negative plate from forming a solid mass of lead sulfate during the discharge cycle. It enables the formation of long needle like crystals. The long crystals have more surface area and are easily converted back to the original state on charging. Carbon black counteracts the effect of inhibiting formation caused by the lignosulfonates. It has been found that sulfonated naphthalene condensate dispersant is a more effective expander than lignosulfonate and can be used to speed up the formation of the battery plate. This dispersant is believed to function to improve dispersion of barium sulfate in the paste, reduce hydroset time, produce a stronger plate which is resistant to plate breakage, to reduce fine lead particles and thereby improve handling and pasting characteristics. It extends the life of the battery by increasing the end of charge voltage. The sulfonated naphthalene condensate polymer dispersant can be used in about one-half to one-third the amount of lignosulfonate and is stable to higher temperatures than lignosulfonate
About 60% of the weight of an automotive-type lead-acid battery rated around 60 Ah (8.7 kg of a 14.5 kg battery) is lead or internal parts made of lead; the balance is electrolyte, separators, and the case. "
From Loveley,Wonderful Wikipedia,Bottom line,YOu don't need a voltage higher than the battery's voltage to charge An SLA,Or any Lead acid battery.
And,Aperently,My charger charges it at 11V,And in a few hours It gets charged.
a lead acid battery is loads of plates(12-28) for this reason.
Hmm. I'm not entirely sure what all this info has to do with supporting your argument. Seems to me that if you connect a dead battery at 12.0V to a charger that is at 11V, electricity is going to be flowing the wrong direction?
No,It wont,Because the CHarger has more current output than the battery does,at that point.
Its just the way it works,Just try it.
Read the Wikipedia article Sulfation Thats basicly how A Lead acid battery works,It does not need to recive a higher voltage than the Cell voltage to charge.think of it as a tank of water,as you charge it,you fill the tank with water,When it is fully charged,The tank is full,You fill it by adding water,Thats kind of how it works
sealed and valve regulated batteries are usually lead-calcium batteries and can cope with up to 15v!
you connect green to ground to turn on the power supply.
What do you mean?
you have to connect (usually green)to ground(black) on some computer power supplies to turn them on.
Oh, Yeah, I think that it for the newer ones.
you want to use 28volt 3Amps for 6hours (must use a regulator and fuse and 10w 1ohom resistor) charged when the current goes below 170ma.