for anyone out there who makes their own lights, i need sum help. i went to Radio Shack today and bought 4 jumbo red leds. I also bought a ‘AA’ battery holder, the power around 3 volts which is enough since jumbos have low resistance as far as i know. i built a simple, display of the 4 jumbos so they can lite inside, and suddenly, one went of. i checked the wires, but everything was attached… then it started not to come on at all. Worst yet, the 'AA’s got hot and began to melt the holder. If anyone asks if i didn’t use resistor, well yes i used resistors, but it still wouldn’t work. any suggestions?
You shouldn’t have left overheating batteries alone long enough to melt the holder. This is EXTREMELY dangerous.
Jumbo LEDs require a lot more current than standard LEDs. You were basically putting too much strain on the batteries, causing them to overheat.
For safety reasons (and especially for anyone else reading), unless you know what you’re doing, just buy a kit from someone who does.
Batteries getting hot is a sign of rapid discharge… That rapid discharge can be from the circuit drawing too much current but most likely it’s because of a short… Batteries melting a holder is a sign of HUGE current draw almost certainly a short…
To know what you did wrong we need lots more information, pictures, circuit diagram, parts specifications to start with…
The LED not lighting up won’t be a wiring issue, especially if the others remained lit (if it’s a basic loop circuit, then if one isn’t getting power then none of them will) because it’s probably been burnt out by the same issue that led to the batteries melting the holder.
Proton Pack lighting kits can be expensive, but I think that that’s offset by the quality of the kits that are available.
thanks for the feedback, now two 'AA’s don’t make that much power, and I learned the hard way that a 9 volt unless u have enough resistors is lethal. take this into account.
I made an EKG from a 9v battery.
I second that. Just about the only way to get a battery hot enough to melt the holder is if you have a short.
And, when an LED stops working it’s normally because it has too much current running through it.
Can’t say I’ve ever melted a battery holder, but I’ve certainly gotten them hot, and I’ve definitely burnt out my share of LEDs.
Also wired a couple of chips up wrong and got the magic blue smoke of death. 
But that comes with the territory when you’re an electrical engineer… Datasheets aren’t always correct…