Your Vapcell cannot be more recessed as my Samsung 21700…here is the answer to your question:
Remember when even the SkyRC MC3000 had contact issues with flat-tops too? Yes, this Vapcell S4 does make positive contact with the 21700, and all my other flat-tops. See why in the photos below:
SkyRC MC3000 left, Vapcell S4+ right:
The Samsung 21700 inside the bay still has plenty of room to spare, up to 75mm.
Thanks tatasal.I could see clearly the upper part of s4 plus positive contact point protuding more than my xtar Vc4
The vapcell 21700 5000mah positive terminal quite low compare to other batteries.
Im glad im making the right call.Still waiting my s4 plus to arrive.Thanks for uploading the pictures.It does helps me and maybe others too.Thanks again.
I tested the IR of my unsused, brand-new Samsung INR18650-25R. No rolling nor pressing of sliding negative contacts on all occasions, just pulled back cell to lose contact then release.
I realize this charger does a lot.The things it does not do are important to me.
Another negative in my book is it can Only discharge “Two” batteries[Slot 1 and 4] at 1 amp.
I test Four batteries a lot. Doing them at 500mAh will take twice as long.I do not understand why?! It can charge all 4 slots at 3A yet it can only discharge Two batteries at 1 amp!
During charging most of the energy is being put into the batteries requiring a big enough power supply that can do so. During discharging all the energy from the batteries is being dissipated as heat thru a resisitor or resistors. Its a matter of how much energy that can be dissipated for its size. 4.2 volts at 1 amp x 2 basically it can get rid of 8.4 watts of energy. The more energy that has to be dissipated the bigger the components and heatsinks has to be. I brought this up in the BLF designed charger thread. The making of the BLF UC4 charger: the start of a new venture, INTEREST LIST, UPDATE 7 (Well, ramping stopped :/ ) - #141 by moderator007
Its a matter of fitting everything needed in one simple unit without it being a boat anchor. Sacrifices have to be made. To me switching to a aluminum case would improve alot of the design for getting rid of heat and energy increasing discharging current but some dont think a conductive metal case is safe even though every hobby charger I have ever owned used a aluminum case that is isolated electrically. Just my two cents .
I have not tested to a fully-charged cell yet so I haven’t heard it yet. So far what I heard is soft, pleasant sound upon plugging, so I don’t know if the sound is the same or not.
Comparing this charger with my other charger that features an Auto mode (specifically the Miboxer C4-12)…most times with the C4-12 I get to change it into the Manual mode because it is very inconsistent in IR readings which run into the hundreds regularly. As you know with these Auto mode charger, the higher the IR the lower the charging rate, so low that it will only charge .3A.
The Vapcell S4 has so far not shown to have the C4-12’s usual inconsistent mistaken high IR readings and will charge at a much higher rate in Auto mode.