Topic: Splitting Walmart battery to power 2 devices?

[johnw]

It's been 10 years since I've had physics, so I could use a little help here. If I split the output to power both my MiniMe and 312 off one battery, does this change the Voltage? I'm using a Walmart battery for each and would love to run the MME and 312 off one and the JB3 off the other via one of those SIMA units.

[dnsacks]

john, if you connected 2 wires to the battery's positive output and ran one to mme and the other to the 312, and then connected 2 wires to the battery's negative output and ran one to the mme and the other to the 312, you'd be creating a "parallel" circuit in which each device would receive 9.6 volts from the battery. 

[johnw]

john, if you connected 2 wires to the battery's positive output and ran one to mme and the other to the 312, and then connected 2 wires to the battery's negative output and ran one to the mme and the other to the 312, you'd be creating a "parallel" circuit in which each device would receive 9.6 volts from the battery. 

Thanks! +T
I currently have an adaptaplug coming out of the battery and going into the 312 and was thinking about adding this Y splitter
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=273-1744
to split the cable to the MiniMe and the 312.

[dnsacks]

should work fine, just be extra-careful with polarity (of course)

Only remaining question is how much current these 2 draw together -- how long would the walmart batter run either of these alone?  If, say, 3 hours for the mm3 and 4 hours for the 312, I'd not expect to get much more than 1.5 hours out of the battery when running both at the same time.

[johnw]

I'd say six easy on the MME and several days on the 312. Shouldn't be a problem

[fozzy]

Why not run all 3 off both batteries


BAT 1 -----|---------------mme
                   |---------------312
BAT 2------|---------------VR-----JB3

[johnw]