Battery Schematic?

[Rykk]

Hi. y'all! I work in electronics and do a lot of modding and a WHOLE lot of repairing of my batteries and m-series atomizers. I have a few DSE-801 size/type batts I got and adapted for use with my m-series atties for a site in China - you probably know it but I won't say just in case that isn't cool to do.

Anyhow, they had good long capacities but the problem was none of them lasted very long b4 they crapped out. Took them apart and and found the same 3-pin, SOT-23-like part had burned up in each. I can't 4 the life of me seem to find out what this - or any of the other - part is from its part marking. Seems the Chinese aren't too keen on following JDEC standards. Heck, the PIC(?) in the circuits are usually just marked, "e-smoke". Since the parts are blown and I can't bring myself to potentially break a working batt getting it apart, "forensic" study with an ohm meter isn't too productive.

Surely SOMEONE here with some technical knowledge has come up with or found a schematic or circuit diagram for these batteries by now? If so, please let me know as I'd really like to get my eyes on one so that I know 4 sure what I'm looking at when I open a batt. I've worked on like 5 or 6 different types and the architecture/design of the circuitry appears to be pretty much identical for the automatic switch batts. Help me out if you can, y'all!
C-ya!
Rick

 

[Switched]

Modders Forum

 

[No Brag]

I have asked the same questions in the past and didn't get any answers. I hope you have better luck. I'll keep an eye on this thread and hope for the best. Does the mannual ballery come apart like the automatic? I haven't taken a manual one apart yet. Just wondering how to get it out with the switch intact. Thanks.

 

[Scottbee]

The SOT-23 device is the MOSFET. Depending on the battery system type, it will be either a P-channel or a N-channel.

Many if not most of the 510-class systems use a P-channel, and I typically use the Vishay Si2333DS as a replacement.

 

[medman1234]

yeah!,what he said.

 

[Rykk]

Wow - NOW we're getting somewhere. Scottbee: Ok, what I need to know about is what's in an auto batt of the m4xxx and DSE-801 series. One side of the board has an 8-pin IC that I reckon is a PIC, right?

On the other side of the little board there are 2ea three pin devices. The output to the atty comes from one - probably/maybe a transistor that is switched "on" by the vacuum switch and creates a path for current thru the coil while also blocking voltage/current from the rest of the circuit when a charger is connected? This explains some of the voltage drop to 2.8V at the batt output when the battery is 3.7V.

Not sure what the 2nd SOT-23'ish device is - maybe dual diodes or a transistor? Might be part of the charging/blocking design? Usually, one of the 2 chips is somewhat smaller than the other and part marked differently. Any idea on a pn for the 2nd/smaller chip? Seems the Chinese totally ignore JDEC...

Found out by looking that there is a VERY tiny 3-pin chip inside the vacuum switch, as well. It's probably used to switch the base of one of the 2 xsistors on the circuit board. Figured that out the hard way when I tried to just stick a switch from a manual batt in place of the vac switch and it - of course - didn't work. ny idea what that guy is and maybe it's spec's?

Thanks, man - short of a schematic, replacement part #'s helps a lot and I could draw my own once I find out what everything is and i'll know their spec's.

Rick

 

[Scottbee]

Generally speaking there will be one MOSFET for current delivery (vape), one MOSFET for the charging circuit (reverse current flow).. and in your case, the 3-pin device is probably the Hall effect switch for the magnet in the diaphragm (vacuum switch).