18650 Battery holder experiment |
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This page explains the difference between wiring batteries in Parallel, Series or Series/Parallel. Battery wiring page link Go to the page above to see diagrams on the different ways to wire up batteries. |
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Here's a shot of the assembled holder with the wire hanging out in the breeze You can run the wire any which way you like or use Velcro to secure it. Push the whole assembly together and then screw on the big nut to pull the assembly together. |
You can also feed the wire back through the holes in the end caps You could also add a bit of heat shrink to the wire for some extra strain relief. Note that I am now cutting four holes in each battery holder end. You can drill extra holes anywhere you need to in the battery holder ends. |
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All the parts Note that one end cap center hole is threaded and one is not. I use the threaded end for battery positive and the non threaded end for battery negative on my Parallel battery packs. The end caps now have 4 small holes that wires can enter and exit through. |
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Left: If you are wiring up a Parallel pack you get two of the Parallel boards Right: If you are wiring a Series or Series/Parallel pack you get 4 of the Series/Parallel boards You will have to split one of the Series/Parallel boards into two pieces for Series wiring. |
Bad picture, sorry Sand the back sides of all the terminals so that the solder will flow under the terminals and stick to the surface. |
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Note that I made a jig using small brass nails The nails give you a place to center the battery terminals. You could do the same thing on a piece of wood Tin the copper circuit boards with a thin layer of solder |
Trim the tips off all the terminals Trim the handles off any of the terminals where you need to solder a battery wire to the copper board. |
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Wiring the battery holder for Parallel This will be a 3.7 volt battery pack at 9600 mah capacity See the link at the top of the page for explanations of Parallel, Series and Series/Parallel wiring |
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Solder on all the terminals Note that I use a 40 watt soldering iron for this, so there is plenty of heat available. I have trimmed off the tips of all the terminal handles because they are just a bit too long. I removed the handle completely on one of the terminals on each board, to have a clear area to solder the + and - wires |
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Solder on the + and - wires The terminals with the springs are the - terminals |
Solder on the + and - wires The terminals with the springs are the - terminals |
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Push both boards down into the end caps. You can use a dab of silicon or some sort of glue to hold the boards in place. I install the + terminals into the end that has the threads. It seems easier to assemble the whole battery pack by pushing the battery Positive ends into the end cap and then installing the negative end caps with springs last. |
The end caps have holes that you can use for routing the battery wires |
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Wiring the battery holder for Series/Parallel This will be a 7.4 volt battery pack at 4800 mah capacity See the link at the top of the page for explanations of Parallel, Series and Series/Parallel wiring It may be a good idea to sand the edges of the copper boards where they are close to another copper board. This will widen the gap a bit and prevent batteries from shorting out to another copper board. |
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Wiring the battery holder for Series or Series/Parallel is a bit different. The battery + and Battery - wires leave the battery holder from the same end. |
Here you can see how the batteries will be installed in the battery holder. Note that you must be extra careful to get the batteries and the caps lined up correctly. This is one reason why I prefer soldered together battery packs. |
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Wiring the battery holder for Series This will be a 14.80 volt battery pack at 2400 mah capacity See the link at the top of the page for explanations of Parallel, Series and Series/Parallel wiring |
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Wiring the battery holder for Series The battery + and Battery - wires leave the battery holder from the same end. Note that you will have to split one of the copper boards into two small circles to be able to do this. See the word split up above on the image. A Dremel tool or some sort of saw should work nicely. |
Here you can see how the batteries will be installed in the battery holder. Note that you must be extra careful to get the batteries and the caps lined up correctly. This is one reason why I prefer soldered together battery packs. |
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