ni-mh battery charging

[computer 12]

i got a problem im trying to charge batterys but they stop when i charge thom for like 5 minutes i dont now why please help

[soybean]

More details, please.  Is this a battery for a laptop computer?   How many batteries?  How old are they? How are you trying to charge them? 

[computer 12]

its a double AA and when i try to charge alkaline batteries(non rechargeable) it does not charge     

[Salmon Trout]

when i try to charge alkaline batteries(non rechargeable) it does not charge   

Huh? That's normal. Many Ni-MH chargers will shut off if you try to charge alkalines (They see them as faulty rechargeables). You can't charge ordinary alkaline batteries, and it is dangerous to try, they can explode. Non-rechargeable alkalines are "primary cells" Manufacturers of primary batteries expressly forbid recharging. When they are finished, you throw them away.

Attempting to recharge a discharged alkaline battery can cause the production of gas within the canister. As the canister is normally sealed, very high pressures can be created within it. This can rupture the seal, resulting in leakage of the contents — for example, aqueous potassium hydroxide and identifiable in more severe cases as a hissing sound from the battery — or even an explosion. Warning signs include bulging of the ends of the battery. Recharging a battery produces heat within the battery. Sometimes the heat can be excessive, with the attendant risks of fire, explosion and/or injury.

Potassium hydroxide is corrosive and may cause injury, especially to the eyes and skin, or corrode the battery contacts in the equipment. Eye protection is always advisable when recharging any batteries.

[reddevilggg]

If you've been putting normal Alkaline batteries into a ni-mh battery charger then you are lucky you have not caused a fire. Why you could possibly think charging a none re-chargable is a good idea?

See here
http://www.ehow.co.uk/info_8417947_happens-regular-alkaline-battery-charger.html

I dont want to offend, but aren't there any adults around? Because i'm pretty sure this is common knowledge, so as a safety precaution it may be more practical to ask them before doing anything like this, before you hurt yourself or others.

Nice re-edit Salmon, if i'd have seen that sooner, i would not have bothered to post. 

[Salmon Trout]

I dont want to offend, but aren't there any adults around? Because i'm pretty sure this is common knowledge

I was going to post something along those lines, quite biting I guess, but I recently got a PM from a moderator about excessive sarcasm (I asked if a first-time poster had a Caps Lock key on their keyboard).

[reddevilggg]

I was going to post something along those lines, quite biting I guess,

It could be taken as sarcasm i suppose, but it is not meant that way. When i was young (and there was no internet), if i had an idea like that, i would have asked my parents first, before attempting it myself. My Dad would always have told me the right thing to do and why. Just seems like a bit of a strange question to ask on a forum.

[Salmon Trout]

Just seems like a bit of a strange question to ask on a forum.

Seems that way to me, too. I thought everybody knew that plain old alkalines are used once only. It seems kind of obvious, given that it is kind of hard to avoid noticing that batteries are divided into two tribes: rechargeable and non-rechargeable. He even uses the phrase "non-rechargeable" in connection with the alkaline cells that refuse to charge.

[reddevilggg]

And with a caution on the side of all commercial non-rechargable batteries stating something along the lines of -

Do not mis-use or re-charge due to risk of leakage or explosion.

[Salmon Trout]

Dou you suppose he'll post any more in this thread?

[reddevilggg]

I'm not 

[patio]

Unless he's lookin for a deal on fire extinguishers...

[Salmon Trout]

[computer 12]

ok i just putted the alkalines to see how stupid my charger is not that stupid any way the charger is usb, how many mA does a usb 2.0 and 1.1?
and by the way in the cellar the floor is tilt and its cold

[Salmon Trout]

Struggling to make any sense out of your post, computer12.

USB 1.1 and USB2.0 specifications both define a maximum draw of 5 unit loads, with a unit load being 100mA (therefore maximum draw 500mA). USB3.0 defines a unit load as 150mA, and a maximum draw is 6 units loads (900mA). However the ports on some computers may not be compliant (over or under)

[computer 12]

what i thought that usb 3.0 was supposed to save energy but thanks Salmon Trout 

[Salmon Trout]

If you really want to find out all about the USB versions, why don't you do a bit of Googling?

[computer 12]

ok so will over charging(the charging for too long) my laptop li-ion battery end up with an explosion or fire because my family plugs in when fully charged
and plugs when they turn it on and its fully charged

[Salmon Trout]

Notebook chargers stop charging once the battery is fully loaded (only a 'trickle charge' remains) and this does not damage the notebook or battery in any way.

[computer 12]

not if you plug when it fully charged or when its almost full witch causes overcharging but not too long  keeps charging for about 10-20 minutes long and
will that cause fire or explosion if done to many times? my laptop just froze for a while and the battery is low is that why it could be stopped?

[Salmon Trout]

Read it again

Notebook chargers stop charging once the battery is fully loaded (only a 'trickle charge' remains) and this does not damage the notebook or battery in any way.

[computer 12]

no they dont really trust me

[Salmon Trout]

no they dont really trust me

Who don't trust you?

[reddevilggg]

First you mention AA non-rechargable batteries being charged and we tell you it dangerous.

Now you're asking if charging a laptop battery is dangerous and we're telling you it is not.

The rest of your posts are hard to understand, be more specific.

[quaxo]

First you mention AA non-rechargable batteries being charged and we tell you it dangerous.

Now you're asking if charging a laptop battery is dangerous and we're telling you it is not.

The rest of your posts are hard to understand, be more specific.

Yeah, I'm still trying to figure out how we got from ni-mh to alkaline AA batteries to li-ion laptop batteries.

Computer12, I haven't taken my laptop battery out of the laptop in over 3 years. Never had a problem with overcharging, explosions, or anything else. Just the fact that it ways a bit more with the battery in. Also, don't toy with dangerous things when you don't understand them. That's how people go blind, disfigure themselves, cause sterility, hurt their children, and wind up a freak show in some travelling circus.

Do not try to recharge non-rechargeable batteries. Do not put batteries of one type into a charger of another type, even if they are rechargeable (ex. ni-cd in ni-mh charger). And for the love of God, don't put a 9v battery on the tip of your tongue. Not only does it do nothing, it leaves a nasty taste in your mouth.

[Computer_Commando]

no they dont really trust me

Parents don't trust 12-year olds.

[Salmon Trout]

Parents don't trust 12-year olds.

Especially after they put alkalines into NiMH chargers

[BC_Programmer]

and by the way in the cellar the floor is tilt and its cold

Oh, well that changes everything. Alkaline batteries are supposed to be able to charge when you have a tilted cold floor.

That is evident sarcasm. I imagine that was supposed to dissuade concerns of fire or explosion hazards, but not really. If it catches fire or explodes, you may still be in the vicinity, and there is no way to predict what a indoor explosion or fire would do. Assuming that because you have a "tilted cold floor" your dwelling is somehow safe from these hazards is rather foolish.

That's how people go blind, disfigure themselves, cause sterility, hurt their children, and wind up a freak show in some travelling circus.

Perhaps that's for the best.

[computer 12]

if you you overcharge a li ion batteries for a litlle while evry day

[Computer_Commando]

if you you overcharge a li ion batteries for a litlle while evry day

You should stay in school and work on your grammar and typing.
Battery chemistry & charging is actually very complex.  One of the many reasons why electric cars have been so slow to develop.

Anyway, do some reading here:  http://en.wikipedia.org/wiki/History_of_the_battery
If you want your parents to listen:  sound smart, be smart.
Nobody said it was easy.  They secretly hope that one day you will be smarter than they are.

[Salmon Trout]

if you you overcharge a li ion batteries for a litlle while evry day

To do this you would need a charger that allows you to overcharge the battery. Didn't you understand what was written before? Are you trolling? If the charger cuts off when the battery is fully charged, you cannot overcharge it.

[computer 12]

http://img120.imageshack.us/img120/7066/fenix4js7.jpg
is that an over charged battery NIMH

[BC_Programmer]

http://img120.imageshack.us/img120/7066/fenix4js7.jpg
is that an over charged battery NIMH

No, it's a battery that asked one too many questions. 

[patio]

It looks like my failed attempt at Rack of Lamb on the grill last weekend...

[Salmon Trout]

http://img120.imageshack.us/img120/7066/fenix4js7.jpg
is that an over charged battery NIMH

No. It's an non-rechargeable alkaline battery that should never have been put in any kind of charger, that some fool tried to charge.