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Old 03-16-2002, 04:10 AM   #1
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Default Bulb discharger

i'm building a bulb discharger...how many bulbs do i need to make a 20 or 30 amp discharger....bulb specs are 12v 25w(i knoe i have to use #1157 but there no number to this bulb that i bought)......does it draw more amp when using with a 7.2v than a 4.8v pack??anyone please help me...i'm not electrically inclined so i dont know what to use for my 7.2v and my 4.8 vpack ....thanks all for looking and replying
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Old 03-16-2002, 04:22 AM   #2
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If your racing stock motors then you need to discharge at 20 amps; that's 10 blulbs.
If you race modified then you should discharge at 30 amps; so you need 15 bulbs.
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Old 03-16-2002, 06:01 AM   #3
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Lightbulb Discharger CHEAP!

I used 3157 bulbs. They have 2 filaments, and are the newer 1157. They have wires you can bend out. I bent out all thewires there are 2 on each side. Bend them so they stick perpendicular to the bulb. I them put the bulbs in a circle. They just fit. Solder all the wires on one side and all the wires on the other side. Hook a heavy wire to each group of wires. It comes out to 10 amps.

Each bulb should look like thisl _0_

Works great, no jig needed or holder when it is finished.

I paid $7.00 for the box of bulbs.

My packs are performing much better since I started using this.

David Root
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Old 03-16-2002, 09:31 AM   #4
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I heard that Bulbs are not good for NiMH...
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Old 03-16-2002, 09:36 AM   #5
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Just remove the bulbs from the battery before they fully go out for NIMH packs.
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Old 03-16-2002, 10:44 AM   #6
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about 10
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Old 03-17-2002, 05:17 AM   #7
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i suggest installing a battery cutoff device (i use a deans black box 2) to prevent over-discharging your batteries. i have a homemade discharger with 10 pcs 12v automotive bulbs, plus the black box.
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