Re: Tek 222/224 Battery Replacement

Jeff Davis


Update on the group purchase. As of this morning, we have deposits for 7 kits, plus I'm planning to order 2 for my own use, making 9 total.

To avoid spamming the list with daily status updates, I've created a web page where I'll keep the current order status<> updated. The URL is

For those of you not familiar with the project, here's a brief summary:

The kit allows the use of readily available 18650 rechargeable lithium batteries to replace the now unavailable sealed lead acid battery originally sold with the Tektronix 222/224 oscilloscope. No modifications to the scope are required other than removal of the original sealed lead acid battery. Charging and protection circuitry is provided, allowing the use of unprotected 18650 cells. The kit will consist of one assembled and tested battery charger circuit board, one 3D printed case, and at my option some miscellaneous parts such as light pipes to bring the LED indicators to the front of the case and a jumper cable to attach to the scope’s battery connector. Kit does not include rechargeable 18650 lithium batteries (required for operation).

Circuit board design based upon the work of Kitsune-Denshi<>. licensed under the Creative Commons Attribution-ShareAlike License.

Case design based upon the work of NearFarMedia on Thingiverse<> licensed under the Creative Commons Attribution License.

Jeff / N0DY

From: <> on behalf of Jeff Davis <>
Sent: Saturday, March 28, 2020 5:51 PM
To: TekScopes <>
Cc: Dave Voorhis <>; Miguel Work <>; benx618(g) <>; <>; g m <>; Dave Holigan <>; Byron Hayes, Jr. <>; SuddenLink <>; satbeginner <>; garp66 <>
Subject: Re: [TekScopes] Tek 222/224 Battery Replacement


Here's an update on the Tek 222/224 Battery Replacement project. After a few go rounds, I was able to create a BOM that the fab house could source. Unfortunately, the parts that had been pending turned out to be somewhat expensive. The cost in low quantities went from $60 each to about $93. Given the minimum order of 10 pieces is committing nearly $1,000 upfront, I need to ask for deposits from people who are interested in purchasing to reduce my financial exposure. If you're interested in participating in the group buy (and hopefully helping us get a better quantity discount), the link is;data=02%7C01%7C%7C9ddf3c8d9e9e4bcff63a08d7d37b624d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637210399184673953&amp;sdata=3HOf5aZem%2FQ5BeQFzLbq36xJ0uORMH4PVjQeOLFVMU0%3D&amp;reserved=0. There you'll find not only details on the deposit and possible volume discounts, there are also links to technical sites for more information on the project.

While I'm not doing this project entirely out of the goodness of my heart, I'm making this first buy available at just slightly over my cost, plus shipping, both as a way of paying back the value I've gotten from the list over the years, and as an encouragement to get the quantities up so we can all get a volume discount. Any volume discounts would be passed along as explained on the deposit web page.

Thanks for the bandwidth.

Jeff / N0DY

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