wiring battery paks in series

[boatbuilder1]

is it possible to wire two 7.2 v paks in series to get 14 volts or will it short them out
I am trying to get the krick uboat to run. the instructions show 2 c cell paks used but makes no mention of the wiring the pump supplied is a 12 volt

please help
btw you all know I am an electrical Idiot right



Edited By boatbuilder1 on 1088800289

[interpol]

If you connect them in

If you connect them in series, it will double the voltage but the capacity will stay the same. If you connect them in parallel, it will double the cpacity and keep the voltage the same.



For your reference.

http://www.allaboutcircuits.com/vol_6/chpt_3/2.html

http://www.allaboutcircuits.com/vol_6/chpt_3/3.html


(also note that you need to be careful when joining battery packs and cells. They need to be as close in voltage to each other as possible.)

[petn7]

if you have 2 packs

if you have 2 packs already made, just cut off the plugs and connect the red (+) wire from one pack to the black (-) wire of the other battery. the 2 left over wires (+ and -) will be plugged into your ESC.

can someone concur with this, since i'm no electrical genius myself.

[fung pang]

stop some thing wrong here!
don't

stop some thing wrong here!
don't cut anything yet, check first.

first I don't have the Krick sub, but is a batter sub then robby one, in hardware set up, the look out of the box is another story. the dumas "dead fish" is realy bad, but i own one......

How many packs you could put in the sub?

i guess, if 2 packs only, one is for the drive, one is for the pump.

a 12v motor runs good with a 7.2v pack.
if you run 7.2v X 2 packs, at 14.4v on a 12v motor, the motor may fry very quickly, or drive all the RC stuff nuts. from all the arcing from the motor.

don't use a machnical switch for the motor, is bad.......

if you realy have to hook up 2 packs, to 14.4, this how.








fung pang

[boatbuilder1]

thanks guys I ran the

thanks guys I ran the pump on one and it works ok so one will be the pump and the other will be the radio power ESc and Radio
thanks guys I tried the connection and almost fried my multi meter what the thanks the plan for this boat shows two paks I wish I could find a 12 volt 5 amp gel cell that would fit in her plenty of run time there

ca

[petn7]

out of curiosity, do you

out of curiosity, do you guys really use those white battery connectors?

[fung pang]

every cheap battery pack, off

every cheap battery pack, off the shell come with it.
"every" cheap speed controler come with it.
every cheap battery charger come with it.
a cheap person like me end up using it.
other bubblehead by the lake/pool, the day you forget you charger, that you have to borrow, come with it.

the white connector tax!
just like computer tax!
you have to use it. if you don't want to go nuts.

good high amp gold connector not cheap.

how many bubblehead run match cells?

how about match jell cell?

if you want to know how bad these connector are, look up R/C cars, on the web.

[ramius-ii]

Hi Chuck]http://batteryweb.com you could probably

Hi Chuck]http://batteryweb.com[/url] you could probably find a 12 volt battery that would work. If it is easier to use 2 7.2 volt packs, then a voltage regulator IC such as the LM-7812 will provide you with exactly 12 volts. The IC's are easy to work with, there is "in", "ground" and "out". I would not necessarily agree with the "burn-out" potential at 14.4 volts, car charging systems put out 13.8 to 14.2 as a norm. If it is a concern, you could use the VR or a resistor in series to drop the voltage. As for paralleling batteries, one trick is to couple the batteries using diodes so one battery does not try to "charge" the other battery. The technique is used when charging batteries in parallel.

Best, Ed

[fung pang]

thanks guys I ran the

thanks guys I ran the pump on one and it works ok so one will be the pump and the other will be the radio power ESc and Radio
thanks guys I tried the connection and almost fried my multi meter what the thanks the plan for this boat shows two paks I wish I could find a 12 volt 5 amp gel cell that would fit in her plenty of run time there

ca

5 amp gel cell? is it littel too heavy.

i look again at hobby lobby wed page on krick sub, they want you to buy their 12 cell pack, deep!

could your charger go up to 12 cells?
if yes, build you own pack. out off the packs you have.

did you bought the speed control yet?
if NO, Stop you may want to talk to SubTech for a new setup.

or change the pump motor! to a batter 7.2V motor.

or also change to a SubTech drive motor setup, for longer run, the stock one may be like the robbe one eat battery for dinner. 15 min run top for that what i read.

fung pang
SC#400

[interpol]

I'm contemplating ordering 4 -

I'm contemplating ordering 4 - 50amp lithium ion cells. But they are not cheap. The weight would be about 6 lbs, and size wize it is the same as a 12amp lead acid.

But 50 times as expensive.

[fung pang]

boy, you are loaded.

fung pang
aka

boy, you are loaded.

fung pang
aka cheap-sub!

[Guest]

thanks guys I ran the

thanks guys I ran the pump on one and it works ok so one will be the pump and the other will be the radio power ESc and Radio
thanks guys I tried the connection and almost fried my multi meter what the thanks the plan for this boat shows two paks I wish I could find a 12 volt 5 amp gel cell that would fit in her plenty of run time there

ca

Hi. I recently completed the Krick u-boat. Started to go the 2 pac route suggested by Krick but I found a nifty gel pac at Allectronics.com (cat #GC-612, 6 volts, 3.8" x 0.93" x 2" hi). Get 2 and they'll mount in side by side sitting upright. I used a seperate 4.8 v nicad for the receiver (sits under the rx). Had fits getting the x@#* pump to fit in the wc as shown, then said why do I want to do that. Got a can of tool-coat liquid rubber at Lowe's & dipped the pump in it a couple of times after soldering on wire leads; then mounted it in front of the wc with just the leads penetrating thru seals into the wc (see George Protchenko's article in March's SCR). Works great! Sub appears to have good run times plus the added bonus of ballasting out nearly perfect!