Stacking two different types of batteries?

[PsychOfMSE]

Is there any inherent danger in stacking two different types of batteries? Say:

AW icr 123 / 16340 750mah 3.7v protected battery

and

AW IMR 16340 3.7V 550 mah

Really looking for a knowledgeable answer, not just a "It's probably not a good idea". Is this dangerous? Will one just drain before the other? Will they blow up in my face?

Thanks guys!

 

[Song]

Its not a good ideal to stack different types of batteries, especially different rating ones, usually when you stack batteries to start with your supposed to charge them together, mainly because you want to keep the internal resistance of both batteries the same. 2 different kind of batteries will not have that. , use 2 imr or 2 protected circuit ones, not one of both.

 

[PsychOfMSE]

This is more of a curiosity question than a practical application question.

The way I understood was that when you stack batteries the top battery discharges before the bottom one. i figured in theory if you put a higher mAh rating battery on top it they would discharge at about the same rate.

But I really have no idea, looking for someone with a solid knowledge of battery chemistry to fill me in.

 

[Switched]

This is more of a curiosity question than a practical application question.

The way I understood was that when you stack batteries the top battery discharges before the bottom one. i figured in theory if you put a higher mAh rating battery on top it they would discharge at about the same rate.

But I really have no idea, looking for someone with a solid knowledge of battery chemistry to fill me in.

Short strokes, Song is right. Not only should you not use different battery capacities in a stacked condition, mixing chemistries is asking for trouble.

Long story Basic to Advanced Battery Information from Battery University

 

[PsychOfMSE]

Short strokes, Song is right. Not only should you not use different battery capacities in a stacked condition, mixing chemistries is asking for trouble.

Long story Basic to Advanced Battery Information from Battery University

I'm not disputing the fact that he may be correct. I'm looking for the reason WHY and what exactly the dangers are. Will it blow up in my face? Just create a little extra heat? Discharge unevenly?

There's a huge difference in "no, don't do that, it will have a catastrophic failure" and "no, dont do that, one of your batteries will drain before the other".


Sent from my iPhone using Tapatalk

 

[Switched]

read the link I posted, sent from my normal keyboard. I get tired doing homework for everyone.

 

[VpnDrgn]

I believe the short circuit protection will cut in on the protected batt. True, the top batt drains first when stacked,
but when you are not drawing on the batts, they will try to balance charge between them and the IMR will draw to
hard on the protected batt. I think this will make it almost impossible for them to stay balanced.

That is why it is so important to keep stacked batts together as a pair, when using and charging.

Balance is important for safety and health of batteries.

 

[PsychOfMSE]

read the link I posted, sent from my normal keyboard. I get tired doing homework for everyone.

I definitely will read it now that I am home. I replied from my phone while I was at work. Not sure why you're being rude about someone asking a question in a forum intended for question asking. Thank you very much for the link, but that really didn't answer my question.

 

[PsychOfMSE]

I believe the short circuit protection will cut in on the protected batt. True, the top batt drains first when stacked,
but when you are not drawing on the batts, they will try to balance charge between them and the IMR will draw to
hard on the protected batt. I think this will make it almost impossible for them to stay balanced.

That is why it is so important to keep stacked batts together as a pair, when using and charging.

Balance is important for safety and health of batteries.

Thanks for this answer, it explains a lot. I was never intending to actually do this, just wanted a clear explanation on WHY not to do it. I just get tired of people on here acting like they are knowledgeable on a subject because they puke out the same info that someone else puked out. It's always a trickle down effect and not many actually know the REASONS behind the answer.

 

[Switched]

Thanks for this answer, it explains a lot. I was never intending to actually do this, just wanted a clear explanation on WHY not to do it. I just get tired of people on here acting like they are knowledgeable on a subject because they puke out the same info that someone else puked out. It's always a trickle down effect and not many actually know the REASONS behind the answer.

... and that is why I enrolled you in Batt U. It answers more questions while you are reading. If you want the short version, one is forcing the other, and the other cannot accept the heavy current going through it. It's like pushing a golf ball up a garden hose.