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Step 4Add the "contacks" to the connector
If you have a device where there may not be a series connection between the batteries then you'll need to cut each piece of dowel to the length of an AA battery minus the height of the thumbtack caps. My thumbtack caps are about 1.5mm.
An AA battery is about 50mm long so the pieces of dowel are cut to 47mm for individual battery substitution and to 97mm for an combined inline configuration. You can adjust this measurement for a tighter or looser fit. In practice 48mm and 98mm gives a little bit tighter fit.
Use a stick pin to start a hole in the center of each end of the dowel. After the holes are started place the point of the thumbtack in the hole and hammer the tack down until it is seated. Mark the end of the dowel with the correct polarity of the "contack."
Tape can be used to secure the wire to the dowel. You can get fancy and cut a channel for the leads along the length of the dowel if battery compartment space is at a premium.
An AA battery is about 50mm long so the pieces of dowel are cut to 47mm for individual battery substitution and to 97mm for an combined inline configuration. You can adjust this measurement for a tighter or looser fit. In practice 48mm and 98mm gives a little bit tighter fit.
Use a stick pin to start a hole in the center of each end of the dowel. After the holes are started place the point of the thumbtack in the hole and hammer the tack down until it is seated. Mark the end of the dowel with the correct polarity of the "contack."
Tape can be used to secure the wire to the dowel. You can get fancy and cut a channel for the leads along the length of the dowel if battery compartment space is at a premium.
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