Hump Pack Alternative
10-07-2010, 09:45 PM
#1
Hump Pack Alternative
I was wondering if I could use 2 Lithium CR2 batteries (3v each) instead of a hump pack. What are possible problems in the future? I understand these aren't rechargeable but I have a few available and they're supposed to last long. Any ideas?
They are Energizer Lithium Photo...
They are Energizer Lithium Photo...
Last edited by quixoticboi; 10-08-2010 at 10:49 AM.
10-08-2010, 10:52 AM
#4
Says that it's rated at 800 mah each... Here's the spec sheet:
http://data.energizer.com/PDFs/CR2_EU.pdf
http://data.energizer.com/PDFs/CR2_EU.pdf
10-08-2010, 12:16 PM
#5
My bad, I was thinking about the disk batteries, CR3s.
Two of these would be equiv to a 1600mah hump pac. Just wonder how they'll do when the mah is made mostly of current since RC servos pull more current than a camera. The discharge graph says these should work, but the voltage is going to always be below 6v.
Depending on what servos you're running, the max discharge of 1amp may be a prob. Since you've already got them, give them a try, don't see anything that it can hurt. Check the temps on them after running a little while. If they're having trouble with current demand, they'll prob start getting hot.
Two of these would be equiv to a 1600mah hump pac. Just wonder how they'll do when the mah is made mostly of current since RC servos pull more current than a camera. The discharge graph says these should work, but the voltage is going to always be below 6v.
Depending on what servos you're running, the max discharge of 1amp may be a prob. Since you've already got them, give them a try, don't see anything that it can hurt. Check the temps on them after running a little while. If they're having trouble with current demand, they'll prob start getting hot.
10-08-2010, 01:47 PM
#7
Prob 1st thing to do is to tape or glue the two cells together with the ends reversed to each other - neg and a pos at the same end. I use shoe goo since its strong, dries pretty fast and is easy to remove.
Then take some 16-18ga wire and connect the 2 cells neg to pos on one end. Use a servo extension and cut the fem end off and solder the remaining ends to the correct ends of the two batteries. Red is pos.
Its usually typical to rough up the ends of the cells where you'll be soldering. I wipe them off after that with a rag wet with motor spray to make sure there's nothing to interfere with the solder sticking. Use some flux while soldering.
There's a bunch of pack making DIYs on Utube.
Then take some 16-18ga wire and connect the 2 cells neg to pos on one end. Use a servo extension and cut the fem end off and solder the remaining ends to the correct ends of the two batteries. Red is pos.
Its usually typical to rough up the ends of the cells where you'll be soldering. I wipe them off after that with a rag wet with motor spray to make sure there's nothing to interfere with the solder sticking. Use some flux while soldering.
There's a bunch of pack making DIYs on Utube.
10-09-2010, 10:44 PM
#8
Tech Regular
iTrader: (6)
Prob 1st thing to do is to tape or glue the two cells together with the ends reversed to each other - neg and a pos at the same end. I use shoe goo since its strong, dries pretty fast and is easy to remove.
Then take some 16-18ga wire and connect the 2 cells neg to pos on one end. Use a servo extension and cut the fem end off and solder the remaining ends to the correct ends of the two batteries. Red is pos.
Then take some 16-18ga wire and connect the 2 cells neg to pos on one end. Use a servo extension and cut the fem end off and solder the remaining ends to the correct ends of the two batteries. Red is pos.
10-09-2010, 10:51 PM
#11
Tech Apprentice
iTrader: (5)
if you ignore this you will end up with a run away unit or just not enough current left for a response back to the transmitter...
1) crashes due to poor response time..
2) runs off a clif because all the juice left the battery's...lol
sometimes stock setup in the end for receivers
is the way to go unless your looking for lighter faster moving stuff...lol
10-09-2010, 10:57 PM
#14
Tech Regular
iTrader: (6)
After you connect two in series (+to-), think of them as a single cell, since essentially, now they are. Build two of those. You'll have a + & - left over on each.
Now connect the +'s of each together (remember, they are each considered one cell now), and connect the -'s together.
Again, the whole contraption can be considered once cell, albeit a little bigger and with wires hanging out all over.
Connect your receiver leads to the appropriate terminals and.... done.
What is the weight of a 5s hump or 4AA alkalines compared to 4 of these Lithium cells? How about size?
Now connect the +'s of each together (remember, they are each considered one cell now), and connect the -'s together.
Again, the whole contraption can be considered once cell, albeit a little bigger and with wires hanging out all over.
Connect your receiver leads to the appropriate terminals and.... done.
What is the weight of a 5s hump or 4AA alkalines compared to 4 of these Lithium cells? How about size?
