Wiring Help - Limiting battery source

[nemik]

Hello All
Okay so I decided to run a 7.4 volt pack in my mace fx lightsaber since the battery compartment corroded instead of trying to restore it...

okay so I was under the impression that the master replicas board was already resisted sine it runs a 9v source in this saber's stock battery compartment so I put my new battery pack inwired it all up and of course fried the red lux III led that I have in it. So I have a spare white P4 Led as well and was going to put it in instead but I am trying to figure what I should do about the battery?

Its a 7.4v source and I need to limit it to around 3.7v so that I don't blow this one out to.
SO waht do I need to do to get this to work?

Thanks for any help it is appreciated
PS Im not the best at wiring...

[(null).exe]

take out one of the batteries?

[nemik]

I want to use both batteries so that it last longer, it will suck the juice out to quickly with one. I would have gone with 4 standard batteries but not enough space. THe saber requires 3.7 - 4.5 volts to run

[tachikoma1]

If you wire the batteries in parallel (+ to + and - to -) instead of series (+ to -) you get the base voltage (3.7v) but twice the capacity. Also, if you get the Li-ion batteries with tabs, it makes this MUCH easier. If you're sure it needs 3.7 4.5v and it runs normally on a 9v batt, then the board must have a voltage regulator or something. Not an expert on fx boards. If it was just the Li-ion batts and the P4, Ohm's Law is your friend: I=E/R.

[Jay-gon Jinn]

Just because your Mace uses 6 AA's doesn't mean it runs on 9 volts....those battery packs are wired in a parallel set up for two sets of three that will total 4.5volts with double the capacity (run time) of a 3 AA battery pack. Put a multimeter on the pin-outs on the battery pack with 6 AA's in it and you'll see what I mean. Also, most MR boards will fry if you attempt to run them on more than 6 volts, so if you really want to use a 7.4v Li-Ion set up, you'll need to get a voltage regulator that will limit the voltage to 5 volts. These can be found at most local Radio Shack stores.

[Skottsaber]

FX boards can run on a single Li-Ion, so just wire your cells in parallel.

[nemik]

hey is it possible to put a regular 1.2 volt AA battery in with a lithium just make connection in the battery box and it would give me the required voltage or could that screw something up? just curious, but otherwise I am going to try them in parallel that seems the a good option and I may also get a volt regulator so that I don't blow something up as well. Oh could I just wire a buck puck in there from the saber shop?

and an alternate question on wiring is it possible to get a touch sensitive button wired up to a saber like those touch on lamps?

Thanks all for the help and if there is anything else you can add it would be greatly appreciated.

[Jedi-Loreen]

NEVER mix different battery types.

There are dummy cells in the Store for that purpose.
http://www.thecustomsabershop.com/AA...Cell-P522.aspx

[Azmaria Dei]

you CAN mix NiMH and Li-Ions... if you want to build a BOMB...

just run the FX board on the Li-Ion 3.7V - they really only need 3V and all of mine run perfectly fine on a single Li-Ion cell.

[Skottsaber]

hnd an alternate question on wiring is it possible to get a touch sensitive button wired up to a saber like those touch on lamps?

yes.