I got some totally dead cell phone batteries from my iphone 5S which are reading 0.000V on my multimeter. I am trying to make these batteries alive by attaching it with DC power supply. My battery rating is 3.8 volt and I am supplying 4.0V on it

Just wondering would it work ?

 

Not advised. You should use a battery charger that complies with the charging algorithm for Li-ion batteries.

 

Thanks DL324 , just curious to know if it works or not , if no than why ?

 

just curious to know if it works or not , if no than why ?

Did you read the wiki article? Battery can explode if charged improperly. Any battery can explode if abused.

 

I am totally aware of that , I am not charging it to full. I am aware I am only connecting positive and negative terminals with it so it won't check charging threshold point and temperature. My concern is to just make it alive. Most of the time when its at 0.000 volt, Cellphone circuit detect it as dead battery and charging chip wont let it charge. but if its like 1-2 Volt in it it starts charging right away in my cellphone.

So I am planning to charge it only for 10-15 minutes at 4.0Volt , is that okay ?

 

I got some totally dead cell phone batteries from my iphone 5S which are reading 0.000V on my multimeter.

That alone tells me the batteries are bad as in no longer any good. While I find 0.000 Volts hard to believe should that be true the battery is likely a dead short. Cell phone batteries are "smart" batteries and the required chargers are also smart, including monitoring the battery internal temperature during charging. Simply put charging them is not that simple.

I am totally aware of that , I am not charging it to full.

If you are totally aware of that then you know the answer, no that is not OK. However, if you choose not to listen to any warnings then by all means go right ahead but don't be surprised if you get an exploding or burning battery hurting or maiming yourself. You were warned.

Ron

 

What you are asking is similar to this analogy:

"My child is having a birthday celebration and we have no knife to cut the cake, is it okay to use a broken bottle to cut the cake?"

See my point? it might sort of work, but most likely, you will just make a mess.

 

What you are asking is similar to this analogy:

"My child is having a birthday celebration and we have no knife to cut the cake, is it okay to use a broken bottle to cut the cake?"

See my point? it might sort of work, but most likely, you will just make a mess.

Actually a little closer to:

"My child is having a birthday celebration and we lost our plastic cake knife that my 8 year old has used to cut his cake in the past. Is it safe to let our 8 year old use a chainsaw to cut his cake"?

 

Thanks a lot guys for your answers with very impressive analogies ... Appreciate your help

 

If you are physically present and monitor temperature and disconnect to take voltage readings it should not be a serious safety concern. A cookie sheet with a layer of sand on it and more sand to cover kept handy is advised.
Do it outside. That is my advice. Metal fire is the worst kind. Smothering it is about the only way to contain it.

Most likely your battery is disconnected from the terminals internally due to an over heat event in the past

 

The safety circuit is doing exactly what it was designed to do; prevent you from charging a dodgy battery.