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I have a number of batteries i bought from someone and checking them the voltage is 0. I was going to connect a couple aa batteries to them to see if it will hold enough to put it in an iPad to see if it will start charging. Anybody done anything like this before ? Thanks
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I tried using the naval battery to help me start to be able to charge the iPad. But to no avail, I think the batteries are just too old. I got these and like 2018 from a guy who was selling his stuff from his phone repair business. But I appreciate all the comments like I said, tried some of these. I had several quite a few a dozen or more just took them to the recycling center near me. Thanks for everyone’s input on this.
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I mean 9 volt battery I tried to reactivate them.
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Perry, I assume these are Lithium Ion batteries, because you mention the iPad. From what I have read, when the voltage gets that low, there is probably damage internally so it is unlikely that you can revive them. You might try low voltage, 1 volt or 1.5 volts, briefly, to see if anything internally can be revived. Remember -- lithium batteries can be dangerous so keep anything that burns away.
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Okay, first off my advice is DO NOT DO THIS!
Now, for those of you who are going to go ahead and ignore this advice, I faced a similar situation with some Acer Iconia W510 tablets that had batteries in the keyboard that would no longer charge. I ran across a thread detailing instructions on connecting a 4.5-5V power supply directly to the battery terminals for a half hour or so, which resulted in the battery having enough charge that the tablet was then able to charge it normally. Here's the thread.
Acer W510 keyboard dock battery 0% and charging — Acer Community
Note that I was extremely paranoid when doing this; so much so that I took the battery outside and set it on a concrete deck behind a concrete retaining wall before I plugged it in, and left it there while it was charging. So even if it blew up, it wouldn't have caused a fire. Occurs to me now I should have set up some Barbie dolls next to the wall in case it did; I might have gotten some cool nuclear weapon-style shadows on the wall!
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@perrygreen I do not suggest that you do it just because I do it :-) Just do it outside and have a bucket with sand ready (NO WATER) Then connect a 9V battery to your iPad battery. You will only need this for about 3-5 min at a time. So, use alligator clips etc to connect it to your iPad battery. MAKE SURE YOU DO NOT REVERSE THE POLARITY ETC.
The reason this can work is because your iPad battery may have "gone to sleep". If they discharge below the charging threshold, they will "go to sleep" and need to be "awaken". The voltage from the 9V battery is usually enough to get the battery past that threshold where it can then be charged in the normal way. Of course, there can also be other issues with those batteries (i.e. bad fuse on the battery controller etc.) in which case this will not work.
Anytime you mess with lithium ion batteries you are running a risk of having "catastrophic failure with flame" in which case you place the battery in the bucket of sand to minimize personal and property damage. Again, just because I do it does not mean you should :-) We just can't recommend it.
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