Re: Tek 222/224 Battery Replacement

Jeff Davis

Hi Gary,

What I'm planning to do for the battery charger is have the boards fabricated and stuffed offshore. I'm awaiting a final quote from them - they need to source a couple of parts. So the "kit" I would propose to provide would be an assembled and tested PCB, a 3D printed case that fits into the battery cavity of the Tek 222/224 (without modifying the scope other than removing the SLA battery), and possibly a few miscellaneous pieces such as light pipes to bring the LED status lights to the front of the case and a jumper cable to go from the board to the connector on the scope. (Speaking of which - would you happen to know a source for the female connector that goes on the end of the cable the plugs into the male connector on the scope?). Buyers would have to provide their own 18650 Lithium batteries - but they could be the cheaper unprotected version since there's overcharge protection built onto the board.

I've attached a couple of pictures of the case installed into a 222A.

I'm thinking for TekScopes members who order in the initial batch a price of my cost plus shipping plus $10. The $10 is to take my wife out to dinner so she'll continue to support me doing these crazy projects! After the first batch I'll see what the market will bear in terms of price. Right now in quantities of 10, my cost would be about $60 each.


From: <> on behalf of g m <>
Sent: Thursday, March 26, 2020 11:37 AM
To: <>
Subject: Re: [TekScopes] Tek 222/224 Battery Replacement

I'd be interested also, regards, Gary

On Thu, Mar 26, 2020 at 2:14 PM Dave Voorhis <> wrote:

On 26 Mar 2020, at 17:02, Jeff Davis <> wrote:

Hi all,

One of my customers approached me a few weeks ago about a project to
replace the sealed lead acid battery (now unobtainium) in Tek 222/224
scopes with lithium ion cells that presumably will continue to be available
for the foreseeable future. He pointed me to a really well done project
with a public domain license. There's a YouTube video on it -;data=02%7C01%7C%7C009602ec1fbc4ca1fff708d7d1c58fa1%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637208518750518674&amp;sdata=3LLpfBLKpD4ou3O%2F21bIM26qi5S3VSq%2B4aM68HOss9E%3D&amp;reserved=0.

After a couple of weeks of capturing schematics, sourcing parts, etc.
I'm about ready to hit Send on an order for the PCBs. Before I do that,
however, I wanted to check with the community to see if there's sufficient
interest to order more than the minimum quantity of boards.

How about it, Tek 222/224 collectors? Any interest in a battery pack
replacement based on the design in the YouTube video above?

Jeff / N0DY
Definitely interested. I bought a 222 to add to my collection, but it’s
turned out to be surprisingly useful. I’d like to replace the dud lead-acid
battery but the usual replacements involve cutting the case, which I’m
reluctant to do. I think the YouTube video approach doesn’t cut the case?

I didn’t watch the whole thing, admittedly.

Either way, I’m definitely interested in a board. I’m in the UK, so I
don’t know if shipping might be an issue though I guess a board should fit
in an envelope.

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