Is this safe?
- Thread starter punchy187
- Start date
- th_trl_thread_readers 0
- Status
Yes NiMH are safe(r) compared to lithium chemistries. They're only 1.2v each, so you would need 8 batteries in that config to get a vapable voltage (taking into account voltage drop due to the higher internal resistance of NiMH cells).
4 NiMH are whats used in the "puck mod." It seems to me that 8 would be way to high unless it was regulated or vv, and I don't think I've seen a NiMH mod with either of those features.
The OP has his batts in series-parallel so two more on each side would be 8 and 4.8v.
Ah, I see now... 8 would be far too unwieldy, at least for me, but interesting none the less.
Is this safe?
I wouldn't mix different types of batteries in an ecig circuit. There, you have an NiMH and a Lithium ion coupled in series. The 3.7v Li-Ion batt can load up the NiMH when the circuit is closed. Dual battery mods are getting serious negative publicity considering the melt downs that have occurred lately. You don't want a bottle rocket in your hand pointed at your face.
Is this safe?
IF your Goal is to cause a explosion then it is safe.
The Li-Ion cell would see the NiMH cell as a big resistor. If the NiMH cell discharges before the Li-Ion cell, it could reverse polarity on the NiMH cell. NiMH cells are safe, but I don't know if that's true when reverse voltage is applied. The NiMH cell wouldn't catch fire, but could burst putting excessive force and heat on the Li-Ion. Overheating or crushing a Li-Ion is hazardous since it can short internally resulting in fire.
If the Li-Ion cell discharges before the NiMH cell, the opposite will happen, the NiMH cell will see the Li-Ion cell as a big resistor. If the Li-Ion is not protected, voltage will reverse on the Li-Ion which would quickly destroy it.
Regardless of the technical reasons, mixing cells of two different types just doesn't sound safe based on common sense. Even mixing Li-Ions that are not matched is a bad idea.
If the Li-Ion cell discharges before the NiMH cell, the opposite will happen, the NiMH cell will see the Li-Ion cell as a big resistor. If the Li-Ion is not protected, voltage will reverse on the Li-Ion which would quickly destroy it.
Regardless of the technical reasons, mixing cells of two different types just doesn't sound safe based on common sense. Even mixing Li-Ions that are not matched is a bad idea.
Interesting, not one real reason of why they would not well work together.
CraigHB covered it pretty well. Even two identical Li-ion batteries at different charge levels can go thermal if one reaches a significantly lower voltage than the other during vaping. People have lost parts of their anatomy playing with multi-battery mods and flashlights (yes, flashlights). Some aluminum flashlights self destruct into flying pieces when the batteries self destruct. Ecigs generally turn into bottle rockets or flaming torches, and some experience sudden destruction that opens up the tube.
All this can be prevented if people follow the guidelines and educate themselves on battery safety.
Plenty of good information on this site.
Basic to Advanced Battery Information from Battery University
And a thread on ECF about the subject
http://www.e-cigarette-forum.com/forum/battery-issues/8852-li-ion-batteries-truth.html
Last edited:
Willy has been around forever and knows all that stuff, he was modding before I(and most of us) knew what a PV was. He's done a lot of research on the subject of batteries so I would say he knows the answer. He's just checking to see if anyone else does. Or I might be wrong. 
You have all you need li-ion batts AW or panasonic. Work to a good regulator and you don`t have any problem with vaping before
My puck I made before I even knew what a puck was got rebuilt as vv less than a mo after starting vaping...I use 6 Nimh AA batts and a TI PTR 08100 regulator...it works great...
and as to mixing chemistries that is bad news...even if the batts are matching MAH because they have diff discharge rates and longevities...nimh is generally rated for 1 hundred or so charges with capacity steadily declining each recharge... while Li-Ions are generally rated at 500 or more charges and from what I have read don't tend to lose much capacity till towards the end of their usefulness....
basicly if you could match every characteristic between 2 diff chemistries of batteries it still wouldn't be safe because those characteristics would change...
Srry WillyB I don't tend to come around much anymore...I have been snowed under doing R&D
as to the OP...It is feasable to setup NiMH batts in that config but to get a vapable voltage you would need more than 4 batts and it is unnessisary...even if you want to have power for VV 6 NiMH in series w a regulator is all you need
Last edited:
Willy has been around forever and knows all that stuff, he was modding before I(and most of us) knew what a PV was. He's done a lot of research on the subject of batteries so I would say he knows the answer. He's just checking to see if anyone else does. Or I might be wrong.
I went back and looked at his join date and post count. Sorry, Willy!
I have no clue where you are getting you information on NiHm but you are way off the mark. Perhaps that may be true on the cheapest batteries you can find but not for good quality NiHm. High quality LS_D (low self discharge) NiHm are rated up to 1500 charges. I have been using eneloops in a Pentax SLR camera for over five years and they are still holding full capacity with no drop off.
I was speaking in terms of using them for an ecig...and I have eneloops amongst other brands and I have to say my eneloops left something to be desired(low amperage) in my puck mod...... batteries have that rating for a reason...high internal resistance...I use high output NiMH or NiZN for my Puck mod it works better when it isn't starved for power...
as for where I get my information I read...A lot...if you beat the tar out of batteries they tend to have a much shorter life span...
No affront intended Stubby just answering your question ...BTW didn't you used to be stosh?.......
- Status
Similar threads
