So I thought I was starting to figure all the battery stuff out and today I was searching for PCB protected 3.7 volt Li-ion batteries and I was looking at a 18650 Ultra-Fire 3.7 volt 3000 mAh with internal PCB protection. I was under the impression that if I got 2 of those batteries I could use them for a high voltage and connect them in series but at the bottom of the page it said not to use those batteries that way as it would cancel out the PCB internal protection...WTF? Another question if I am using one 18650 Tenergy 3.7 volt 1400 mAh Li-ion battery am I supposed to be using an internal PCB protection chip or external pcb protection chip? I didn't think you had to worry about that if you weren't connecting 2 cells in series??
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- Thread starter punchy187
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I don`t have problem with protected batts series connected.For one of 18650 you can use a PCb protection chip.
So two 18650 batteries both having an internal PCB chip is safe to connect in series? Why did they say otherwise? Right now I have a mod using a single 18650 unprotected battery without an external PCB chip. Is that not recommended?
I wouldn't ever use an unprotected battery in a mod. The possibility of *BOOM* just perturbs me.
Of course you can use protected batteries in series, and every battery will be protected by its board.
If you use an unprotected battery and charge it before it drains fully, it's OK. Also you can use some external boards with voltmeter and undervoltage indicator. Here is the example: http://www.e-cigarette-forum.com/forum/battery-mods/284754-meter-low-voltage-buzzer.html With a such board it's much easier to control your battery.
Here is a quote from a blog or webpage about PCB protected batteries. It says"For standalone Li-Ion batteries (LiCoO2) it is very important that this protection is present. In packs with multiple cells this circuit is usual common for the pack and not mounted in each cell." According to this guy you only need one of two batteries connected in series to have PCB protection. Does anybody agree or disagree with that?
According to this guy there are different protection boards. They can be on a separate batteries and, if a few batteries are connected in any way, the board can be common. But these boards are different in construction, and you cannot use an individual protection board for a few batteries.
Here is the 2-batts protection board I bought some time ago:
http://www.ebay.com/itm/260924816985?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
And here is the protection board for individual battery:
http://www.ebay.com/itm/Charge-Disc...774?pt=LH_DefaultDomain_0&hash=item4cfdd88826
Here is the 2-batts protection board I bought some time ago:
http://www.ebay.com/itm/260924816985?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
And here is the protection board for individual battery:
http://www.ebay.com/itm/Charge-Disc...774?pt=LH_DefaultDomain_0&hash=item4cfdd88826
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Here is the PCB chip I bought and still waiting for it to arrive. I am planning on using it with two unprotected 18650 Tenergy 3.7 volt 1400mAh batteries. It looks like it is one part (or piece) so how would I connect it? Is it only going to be connected to one of the two batteries or both?
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Better give the link. And please dont write yellow, my eyes are not young 
These Tenergy are IMR batteries?
These Tenergy are IMR batteries?My friend use both batts protected. Why? Because stacked cells tends to discharge different, It`s possible at 1 batt you have 3.7V at an other 3.6V, for example, and at the 2.8V 2.9V maybe can be a problem.
Better give the link. And please dont write yellow, my eyes are not young
No they are 18650 Tenergy 3.7 volt 1400 mAh Li-ion batteries. Here is the linkage.
http://........com/7eoa4kb
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