How can I charge my battery mod via the battery connector and NOT removing the batteries - mosfets

[Sci]

What does your mod look like? Why can't you use a small slide switch? In on one side comes straight from the battery with a reversed zener, with a high enough voltage rating, in series to block output from the battery but allow input from the charger, the other in comes from your momentary switch. Out goes to the connector.
Flipped one way, vape, the other, charge. Flipped to the charge side while not charging could act as a master cut-off switch.

Or not...

 

[Java_Az]

This might work a bit better edited it really quick in Gimp.Not sure about your resistor values but this here looks workable.

 

[Scottbee]

This might work a bit better edited it really quick in Gimp.Not sure about your resistor values but this here looks workable.
View attachment 25729

Don't think you'll be happy with that. Remember, when "reverse biased" the MOSFET is in "diode conduction" mode. It will have a traditional diode voltage drop.... and usually reduce current handling capability. If the diode V-drop isn't an issue with the charging circuit (going back to some previous comments) then just use the MOSFET for the switch (no additional components required) and be done with it. Or use a mechanical switch and a steering diode for charging.

 

[Gigaah]

What does your mod look like? Why can't you use a small slide switch? In on one side comes straight from the battery with a reversed zener, with a high enough voltage rating, in series to block output from the battery but allow input from the charger, the other in comes from your momentary switch. Out goes to the connector.
Flipped one way, vape, the other, charge. Flipped to the charge side while not charging could act as a master cut-off switch.

Or not...

If I recall my lithium charger tech right the voltage from the charger does not exceed the voltage of the cell in a way that would allow that.

 

[Gigaah]

Don't think you'll be happy with that. Remember, when "reverse biased" the MOSFET is in "diode conduction" mode. It will have a traditional diode voltage drop.... and usually reduce current handling capability. If the diode V-drop isn't an issue with the charging circuit (going back to some previous comments) then just use the MOSFET for the switch (no additional components required) and be done with it. Or use a mechanical switch and a steering diode for charging.

I was not aware a mosfet worked like that. By "reverse biased" in laymens terms your saying that applying voltage in place of the load the mosfet will allow current to flow thru the mosfet but with a diode type voltage drop. I do see this behavior in my multisim program. Its not something I've read about so it never even crossed my mind that this was the case. Many thanks to you. My question is about the voltage drop to the battery when charging. I don't know if this will cause the battery charger to under/over charge the battery when it comes to a standard 510 charger?


I'm trying like hell here. I did a lot of googling and looking at electrical diagrams all "tilt-headed" for awhile trying to make sense of the help being given.