This instructable will show you how to make a simple discharger for your NiCad or NiMH battery packs for Airsoft AEG's or RC cars, boats, planes, whatever. Draining your NiCad battery packs is an important step in preserving the life of the battery, since NiCad's suffer from whats known as the memory effect. The memory effect is when a NiCad isn't fully charged on its first cycle, then depleted, and recharged again. However, it will not achieve a full charge because it's cells have adjusted to half capacity, or memorized half capacity. NiMH pack do not suffer from the memory effect and do not require regular darining, but if you plan on storing one for an extended period of time, you may wish to do so.
The design is not mine though, it is borrowed from this one here
. I didn't see the point in paying $5 plus the shipping for something I could easily make for less that amount.
I bought all the supplies(2 12v bulbs, heatshrink tubing and tape) at Wal-Mart for a total of $5.63.
2 Pack 12v Bulbs - $2.78
Heat Shrink Tubing - $1.96
Tape(you probably have it, but I happened to have ran out)-$.47
You may be able get spend less at other stores or if you already have some or all of the materials.