quick battery question

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ruff

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i have a madvapes vv box and ive noticed that one battery stays at 3.5v when the box doesnt fire any more and the 2nd battery reads 0v, ive tried 4 different sets of batts in this box and all have had the same results... is there a reason the vv pulls all of the juice out of one battery but not the other ?
 

slimest

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As far as I understand, you use 2 batteries in series with a buck regulator connected to them, and one battery (on the same position in the mod) discharges even without load. If so, seems that this battery is shorted in any way. Maybe not exactly shorted, but loaded. Try to interchange the same batteries. If always discharges battery only in a certain position, this is the problem of the mod hardware. Check wiring inside the mod. Maybe some glue you used inside the mod is conductive. Or you used a foil inside etc. If you did not modify anything and you are shure that your batteries are healthy (of course after discharge to 0 battery is not healthy), ask developer about your problem, maybe something soldered wrong.

P.S. try to keep your batteries otside the mod and check if their voltage is the same after, say, night. Also observe correct polarity when connect.
 
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meatsneakers

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What brand are the batteries and charger?

I gave my parents Roughstack kits to quit smoking - after two weeks, they kept saying that none of the batteries would fire. I got them AW IMRs. Same thing, except they died after 1 charge. BOTH chargers broke and overcharged all the batteries to their over voltage cut off of 4.35v. I'm lucky the IMRs didn't explode because who knows what they got charged to, but they were 0v when I tested them.

I was able to get 2 of the protected batteries back online by keeping my multimeter on the battery for a few minutes. They showed 0v for a few seconds, then slowly crept up to 4.3v. I discharged them with a small LED and they've been working fine. I replaced the charger with a Pila.

Check your charger output to see if they're overcharging and damaging the cells. One of the batteries may be getting damaged and has much less mAh available as the protection shouldn't trip until around 2.8v (you would then get 0v from that battery). You can also try using an IMR and checking the voltage frequently to see if one battery is off by more than .2v - then as slimest said you have a short somewhere in the mod.
 

ruff

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Thanks for the replies, they are protected ultrafire 14500s in series in a madvapes vv box mod, i used leadfree solder cleaned the board off after assembly, checked for any shorts or stray wires and didn't find anything, i used a 2 part clear epoxy to secure the 510 battery connector in the box and it doesnt seem conductive. A 5amp horn button for the fire button and a on/off slider for the main off. The charger is a tenergy charger i got off of the internet that accepts different sizes of batteries, the batteries after a full charge show 4.2v with no drop after 24hrs of sitting.

Sent from my SGH-I897 using Tapatalk
 

Java_Az

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Thanks for the replies, they are protected ultrafire 14500s in series in a madvapes vv box mod, i used leadfree solder cleaned the board off after assembly, checked for any shorts or stray wires and didn't find anything, i used a 2 part clear epoxy to secure the 510 battery connector in the box and it doesnt seem conductive. A 5amp horn button for the fire button and a on/off slider for the main off. The charger is a tenergy charger i got off of the internet that accepts different sizes of batteries, the batteries after a full charge show 4.2v with no drop after 24hrs of sitting.

Sent from my SGH-I897 using Tapatalk

The reason one is showing Zero is that is the one protection has kicked in on. I would imagine the other one wouldnt take much for it to trip into protection also. You have to factor in that under load the battery voltage is going to go down quite a bit. You can slap the tripped one into the charger for a couple seconds( This will untrip the protection circuit ) then measure the voltage. I bet it will be pretty close to 3.5volts.
 

tsbrewers

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I have the same mod and the same problem that started a week or two ago. I think it is just the batteries getting bad/old. I have been rotating 3 sets of batteries for about a year and they are just starting to fail. I have tossed a couple that were doing that and ordered a couple more sets of batteries.

Brew
 
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