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Charging two 18650

fq06

Gold Contributor
Member For 4 Years
Yes, most every charger will stop charging at 4.2v. What charger are you using?
 

fq06

Gold Contributor
Member For 4 Years
Yep, no problem. On a side note, let the cell cool a couple minutes before charging if you just used it and it's warmer than room temp.
 

IMFire3605

Bronze Contributor
Member For 3 Years
Member For 2 Years
Member For 1 Year
ECF Refugee
The two danger voltages of Li-Ion 18650 is the lowest voltage you can take one down to is 2.5v though suggested stay above at least 3.0v, below this point the anode and cathode inside which are made of copper start breaking down into the electrolyte solution which recharge and there after could cause micro-arcing inside the battery which is not good. The top end max charge level is 4.2v, though suggested about 4.15 to 4.10 to extend their life, above 4.2v the battery becomes unstable and dangerous. Li-Ion batteries unlike Nickel Cadmium and Nickel Metal Hidride batteries is that they do not keep a charge memory, so you don't have to drain them down to lowest and charge back up to highest, though like once a month or every two months it is a good idea to fully drain and fully charge them at least 1 or 2 cycles to let them restabilize themselves. 3.95v and above is peak power on an 18650, ie the most energized, their nominal voltage rating is 3.7v, so 3.5 to 3.9v is their duty cycle platue, this is where they keep their charge the longest, below 3.5v it is a rapid dive from their.

Not really suggested to keep an 18XXX battery at its most energized 4.2v charge for long, if you are cloud comping 4.0 to 4.1v is the work voltage where they give their all, regulated mod anything above 3.2v per battery is good to use. Good practice with charge and discharge of batteries to keep them the most stable, drain the battery to cutoff/shutoff in your mod, set aside 15 to 30 minutes, put on charger, once fully charged or after charging cycle, set aside again for at least 30minutes, this lets Ions and electrolytes to settle down and mellow out before needing to be energized or discharged when fully energized.
 

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