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Drilling and tapping LiFePO4 battery terminal practicality? (programming.dev)
submitted 2 weeks ago by sobchak@programming.dev to c/askelectronics@discuss.tchncs.de
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I'm wondering how practical it would be to drill and tap terminals to add posts to batteries like this: https://batteryhookup.com/products/2x-sunwoda-lf314-314ah-lfp-prismatic-cells-grade-a-qualified-rohs-certified-ultra-long-life-10-000-cycles

The description says that you can only drill 5mm at most. Anybody do something like this before? I do have a shitty Harbor Freight drill press and couple hand tap wrenches.

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[-] cmnybo@discuss.tchncs.de 6 points 2 weeks ago

It can be done, but I would suggest doing it outside to be safe. Set the depth stop on your drill press so you can't go too deep.

You will need a normal tap to get started and a bottoming tap to finish threading the hole all the way to the bottom. 5mm is not a lot of thread to work with in soft aluminum. Those terminals are intended to have bus bars laser welded to them.

this post was submitted on 02 May 2026
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