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Sold/Expired FS: VoltVamp battery drainers

datiLED

Flashlight Enthusiast
Joined
May 9, 2006
Messages
2,022
Location
Atlanta, GA
For sale are another small run of the VoltVamp battery drainers. The low profile VoltVamp will drain a battery to less than 0.8V while providing usable light, and continue to light the LED to approximately 0.65V with declining brightness. They are especially good at draining "dead" cells, or what I prefer to call "partially depleted". The high grade N52 Neodymium magnets for the contacts allow them to be mounted to vertical surfaces when using an AA or AAA battery. 1.5V use only.

Front row 1-8, Back row 9-16
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Front 1-3, Back 9-11
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Front 4-6, Back 12-14
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Front 7-8, Back 15-16
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Older picture of VoltVamp drainers on side of 'fridge.
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Eneloopy battery drainers with ZXLD381 circuits.
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3400K in front, 5800K in back
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Front row:
1 - 3400K high CRI VoltVamp $12 SOLD
2 - 3400K high CRI VoltVamp $12 SOLD
3 - 3400K high CRI VoltVamp $12 SOLD
4 - 3400K high CRI VoltVamp $12 SOLD
5 - 3400K high CRI VoltVamp $12 SOLD
6 - 3400K high CRI VoltVamp proto* $12 SOLD
7 - 3400K high CRI VoltVamp proto* $12 SOLD
8 - 6000K+/- Nichia HS COW bin VoltVamp $12 SOLD

Back row:
9 - 5800K high CRI VoltVamp $12 SOLD
10 - 5800K high CRI VoltVamp $12 SOLD
11 - 5800K high CRI VoltVamp $12 SOLD
12 - 5800K high CRI VoltVamp $12 SOLD
13 - 5800K high CRI VoltVamp $12 SOLD
14 - 5800K high CRI VoltVamp $12 SOLD
15 - 5800K high CRI VoltVamp $12 SOLD
16 - 5800K high CRI VoltVamp $12 SOLD

17 - 3400K high CRI LED Eneloopy battery drainer (without logo), ZXLD381 driver set at 18mA. $25
18 - 5800K high CRI LED Eneloopy battery drainer (with logo), ZXLD381 driver set at 18mA. $25
Both have V10 green glow epoxy behind LED. In original box with AAA adapter and bone for removing battery.

First Class shipping within the U.S. is $3 per package. (Any number ships for $3.) The first "I'll take it" posted in this thread takes preference over other communication.

A word of caution about the neodymium magnets used in the battery drainers; they are unusually strong, and will jump to magnetic and ferrous objects. Neodymium magnets are brittle, and could crack or shatter if allowed to slam together. Neodymium magnets can affect electronic devices if allowed to come into contact. Note: Some cheaper alkaline or carbon zinc cells are not made with steel contacts. The anode of Energizer Ultimate Lithium cells has poor magnetic properties, and will not hold well.

There is no difference between the VoltVamps made with the black or green/white wire. I ran out of my green and white striped wire and switched to black part way through the run of drainers. To keep track of the VoltVamp battery drainers listed above, all of the drainers have a small number written on the ground contact with Sharpie. It can be removed with alcohol. I am leaving the numbers on the drainers to ensure that the right drainer is delivered.

proto* - This VoltVamp uses a new assembly method that I am working on to improve the conductivity between the contact and circuit. These do not have the reinforcing epoxy, as it will not be required.
 
Last edited:

lion504

Flashlight Enthusiast
Joined
Feb 8, 2016
Messages
1,264
Location
127.0.0.1
I'll take #3. Will these work with any primaries? Incl 123s? Or just AA/AAA? Do the protos have an advantage over older style?
 

datiLED

Flashlight Enthusiast
Joined
May 9, 2006
Messages
2,022
Location
Atlanta, GA
I'll take #3. Will these work with any primaries? Incl 123s? Or just AA/AAA? Do the protos have an advantage over older style?

The VoltVamp has a maximum input of 1.5V. Do not use with 3V cells!
The prototypes use an ultra-thin, flexible PCB on top of the magnet, eliminating the need for conductive epoxy. The magnet is adhered with E6000 and the reinforcing epoxy is not required. There is no benefit to the end user other than the fact that I can build a more consistent battery drainer.
PM incoming.
 

datiLED

Flashlight Enthusiast
Joined
May 9, 2006
Messages
2,022
Location
Atlanta, GA
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