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)