QUOTE(treblecase @ Mar 27 2015, 06:28 PM)
That's the problem with these 18650 batteries. I gather yellow is LG, blue is Samsung, green is Panasonic but how do we know it actually is? It could be a cheap low quality China battery.Â
I think I'll change all batteries to those that has printed brand on it.
QUOTE(uniquexme @ Mar 27 2015, 06:59 PM)
I am also curious why brands are not printed on these 18650 batteries just like those typical AA. It only has printed wording and then another white sticker over it showing the voltage and MAH. So which one of the 3 has the highest discharging rate and MAH? If not wrong 30A is the highest discharge rate available? What are these 18650 batteries mean for actually? I have a super bright torch light that uses these 18650 batteries too but it has a nipple on its + terminal.
Those batteries are usually factory / distributor direct & they are usually meant for laptop battery cell rebuilds. Yes they can also be used for other purposes, including vaping. The info of the battery is usually available on their datasheet. Since we don't have datasheet, the closest alternative you can think of is to Google the model number. Open a few results can make sure the info is identical. Eg. ''Samsung INR18650-25R spec'' Idk why many Malaysian vape stores and online store fail to provide full info.
Anyways, you can use this link too.
http://www.steam-engine.org/batt.aspYou need to know the name and model number of the battery first.
Then, click battery preset & select your battery.
Don't touch anything else.
The amp limit, capacity, nominal voltage & c-rating is there
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On another note, that link (under 'coil wrapping' tab) allows you to build a coil without an ohm meter.
I've tried it, as long as you know how it works & what every figure means, you can build a coil within .2ohm of your target.
But for safety, always use a resistance meter to check.
You must use 'coil wrapping' together with 'battery drain'. It's easier if you both open each in a separate tab on your browser
You need to get your battery wattage based on your desired resistance at different voltages.
Then input the wattage in 'heat flux' under coil wrapping tab. For example, my batt as mentioned above @ 0.5ohm. build will give you about 35W at fully charge 4.2v, it goes down to 20+W at 3.5v...
Hence, now go to coil wrapping. After selecting your wire, gauge, your coil setup, resistance and other figures...
Put that watt in 'heat flux' and check the mW/mm² figure between min & max wattage is between 220 - 310 for (generally) thick clouds (for mech mod). If you cannot achieve that, you need to adjust the resistance of your build etc. For every change in resistance, go back to the battery tab and get the new range of wattage. Redo the heat flux section.
For VV/VW mod, you dont really need to worry about this as you can adjust the volt/wattage to your liking on your mod, but if you are recoiling, it's a good idea to know how hot it gets at a specific watt/volt setting.
Under batt drain, you can also check how much 'safety headroom' you have at a specific ohm & voltage. >55% headroom is recommended. Really good shit.
Again, this is for the advanced & precise fellas, dont mess around if you are sloppy or dont know what you are doing, things can go boom easily.
These link should be included at the 1st post for DIY fellas:
http://www.steam-engine.org/coil.asphttp://www.steam-engine.org/batt.aspOne of my prev single coil build
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This post has been edited by andrew9292: Mar 27 2015, 09:21 PM