batteries
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Depends on a battery. In common 2 first digits is its diameter in millimeters, 3 last digits - length. 350 means 35 mm, 650 means 65 mm. But batteries with protection boards are a little longer than unprotected. So two 18350 unprotected can have approx the same length as one protected 18650. Also there are some batteries with flat plus contact - shorter. Everything depends.
Stacking cannot cause explosions. Explosions caused by shorts if you make something without knoledge
Every laptop has the same batteries in stack.
Stacking cannot cause explosions. Explosions caused by shorts if you make something without knoledge
Every laptop has the same batteries in stack.
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Wrong..No explosion of stacking batts if you use a good safety mod and not make short circuit.
In bad condition may explode li-ion ,li-po staked or not, even a Ego batt may explode. Depends of mod and of user.
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Every time we fire our PV's, we are shorting the batteries out. Safe battery chemistry and safe mods do make all the difference though...
P.S. Thanks for the info on the batt numbers/measurements, slimest. I always wondered the logic behind the numb
P.S. Thanks for the info on the batt numbers/measurements, slimest. I always wondered the logic behind the numb
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you people are wrong. When fire PV batteries it`s no shorting, atty drain 1-2 A from batt, in short circuit this current will be 10 A or more. A li-ion batts must to not be descharge under 2.75V and over charged up to 4.2V.
The "stacking batteries" stigma comes from people stacking 3.2V cells *without* protection and the resulting safety issues. Stacked protected cells are no more hazardous than a single protected cell. As slimest said, laptop computers have used stacked Li-Ions for decades, and they stack four of them. The difference is they are properly protected.
When you say something is "shorted" it means the circuit is taking a short path bypassing normal load resistances. The result is an extreme current condition. Normal loads can not be considered a short in any way. Even if an applied load results in current outside of tolerance, it's called an over-load, not a short.
When you say something is "shorted" it means the circuit is taking a short path bypassing normal load resistances. The result is an extreme current condition. Normal loads can not be considered a short in any way. Even if an applied load results in current outside of tolerance, it's called an over-load, not a short.
sorry to step on toes or offend others, but i use unprotected batts (i use all mechanical mods). never have i had any issues (i may just be lucky). however even unprotected batts do have a measure of protection. when looking at the positive post you will notice 4 little holes, right? well under that cap is a little round ring with a stip over it just like the fuses in a car, radio, or any other electronic device, this stip is designed to pop if there is a hard short on the battery. so anyway even unprotected batts are protected to an extent. just sayin'.
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yep it`s somehow hard to explode li-ion batts, with li-po it`s other story, li-po may explode easy without protection. However never say never..it`s much easy to protect yourself and others, when something it`s goes wrong you will not know how batt explode into your face.
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At a simple google search you may find about ego exploded, so pressure it`s the enemy of vappers.
.At a simple google search you may find about ego exploded, so pressure it`s the enemy of vappers.
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That's a vague oversimplification of battery lengths.
I just measured 4 different 18650s.
66.7
67.3
65.1
68.3
The only 18350s I have are 37.7mm.
I think stacking is ok with the right batteries, safety devices built in (like a fuse) and a good sized vent in the device just in case the batteries vent..no matter the lithium battery there is always a small chance of a vent some more than others. Good venting is probably one of the more important things because no matter how safe these batteries are mass produced so even a 1 in a million mistake and a vent could occur..also if a lithium battery is dropped it can become damaged with no signs and vent without warning.
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