Battery pack wiring

[dogfire]

Hi i need help with making a battery pack i really need to know if a p4 red will work with 2 AAA battery and if so what
resistor well work for that.
Thanks for the help

[Vazan Maceu]

Hello, all the info you need is right around here. I'll give you some pointers to get you started:

http://forums.thecustomsabershop.com/showthread.php?4069-driving-your-LED(No-resistors-allowed)-Read-this

http://forums.thecustomsabershop.com/showthread.php?12482-Ohm-s-Law-and-Resistor-Band-Chart-(with-calculator)

http://forums.thecustomsabershop.com/showthread.php?20-LED-hilt-tutorial

Hope those links are what you need to start your research here ;-)

[Sunrider]

2 AAA batteries will not be enough for any blade led.

[Weaver]

Sunrider's right. One of the first things I read was the datasheet for the LED Engin 10W. Most of them require at least 3v per die. 1.5v on each AAA gets you a total of 3.0v in series. That won't even power the board (4.5v minimum for the PCU). I used six AAA-sized NiMHs in my setup, but only because the Li-Ions weren't readily available. Two 14500s or 18650s should be enough. Either will put you just over 7.0v.

As to the battery packs, it is strongly recommended by most of the users here that you solder your own battery pack. If that's not something you're comfortable with, there are battery holder tutorials on the site as well. I made mine out of salvaged battery modules from some cheap aluminum flashlights.

[cardcollector]

2 AAA batteries will not be enough for any blade led.

Actually, in his case, the P4 red has voltage of 2.3V, so 3 AA's are enough for this LED. Granted, these will not give you a very long runtime, but if you are pressed for space, 2 AAAs will suffice.

LED calculator; http://led.linear1.org/1led.wiz

[dogfire]

ok i wasnt sure on how many voltage an AAA battery had. Thanks guys for the help i think i now what to do for my saber :) and thank for the help.

[Sunrider]

It is not safe to try to pull more than 700 or 800 ma from a AAA battery. Be careful.

[Weaver]

It is not safe to try to pull more than 700 or 800 ma from a AAA battery. Be careful.

Another good point. Batteries can explode if mishandled. This is why the protected Li-Ion cells have their protection in the first place; both to prevent damage from charging and discharging at faster rates than they are designed to handle.

[dogfire]

ik li-ion can blow i have had some blow when i was racing RC cars i over charged the battery and well lets just say it was loud i dont want
to do that again. i will be careful with the batterys and well the LED it self to.