Recent Posts

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1
Thorn General / Re: Mercury 40
« Last post by Moronic on Today at 06:24:19 AM »
Disappointing on the fittings, if that's so. Although realistically it would be a real-world problem only for your grandchildren, unless you're planning a few round-the-world trips. A paint downgrade would be disappointing too.

I'm still really enjoying my Mercury Mk3 650B. Perfect for my use envelope of day rides and light touring, tar and gravel.

Hard to know whether the 40 will be as good, especially as I doubt many Mk3 owners will trade for a 40. Probably it's not quite as good, but that's still very good.

The Mk3 is a great frame for a Rohloff because the rear dropout is designed to prevent the hub outer from rotating without the need for a torque arm, and the cable runs are  Rohloff specific and well thought out. Albeit you still need to protect the frame from the cable outers, in places.
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General Technical / Re: Cateye wireless battery replacement
« Last post by Andre Jute on May 24, 2026, 06:42:53 PM »
One wonders how much per unit it could cost Cateye to engrave the mold for the case with "For battery replacement, press here." An infinitesimal fraction of a penny would be a generous allowance.This isn't a failure of cost accounting but of imagination.
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General Technical / Re: Cateye wireless battery replacement
« Last post by mickeg on May 24, 2026, 11:39:53 AM »
One of my vintage VDO computers from over a decade ago died this past year, too much use in the rain.

I gave up looking for another computer like it with a cadence feature.  So I bought a couple cadence sensors to add to my crank arms, will use the GPS unit for that on my Nomad Mk II and my road bike instead. 

Downside is that sometimes for an exercise ride near home, I do not bother bringing the GPS along since I know where I am going.  Which means now no cadence on those two bikes when I do that.  I can live with that.
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General Technical / Re: Cateye wireless battery replacement
« Last post by Matt2matt2002 on May 24, 2026, 10:20:21 AM »
Many thanks folks.
And many many thanks to Dan. Your tip allowed me to press 'TOP' and open up the battery compartment.

It's a Cateye Adventure CC-AT200W

It must be 10+ years old and I can only recall replacing the batteries once or twice.

Interestingly, the picture that Dan kindly posted does not appear in my instructions!

******
Edit
My instructions are for the CC-AT200W but when I view the actual unit it is labelled Cateye STRADA wireless!
Yikes - nothing like making a compounded error!!

The adventure continues. And those who know me, know I like an Adventure....

Matt

EDIT#2
I found Dan's picture on the net.
So it's a Starda CC-RD300W

The confusion arose because the unit isn't marked CC-RD300 W - just STRADA
And I have paper instructions for the CC-AT200W

I guess I had a different Cateye years ago and kept the instructions.
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General Technical / Re: Cateye wireless battery replacement
« Last post by Danneaux on May 24, 2026, 07:27:14 AM »
Matt,

Per the instructions, you'll need to press on the inner seal cap just above where it is marked "TOP". That should elevate the opposite side, allowing you to pick it off.

See attached, magnified screenshot.

You'll have to reinitialize after. See...
https://www.cateye.com/intl/support/manual/data/doc/CC-RD300W_ENG_v10.pdf

Best of luck, Dan.
[EDIT: I think your inner seal cap may be mis-oriented so the TOP marking is not at the top in relation to the unit body. This may make it more difficult to "press-and-pick off".]
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General Technical / Re: Cateye wireless battery replacement
« Last post by Andre Jute on May 23, 2026, 11:13:42 PM »
Try this, Matt:

A. If the cover is rectangular or square and runs to the edge of the device

1. Press hard on the inside edge of the battery cover. This should be the edge furthest away from where it slides off the main body.

2. Holding the pressure, slide towards the edge.

3. To refit, study the edge of the battery compartment and the underside of the cover. Match them them and apply pressure, then slide until the lock clicks and the back end of the cover is flush with the side of the device.

B. If the cover is round and fits flush

1. Press hard around the edge until you feel some give under your finger.

2. Hold the pressure and rotate counter-clockwise.

3. To refit, study the edge of the battery compartment and the underside of the cover. Match them them and apply pressure, then rotate clockwise.

C. If neither of the above works

1. Inspect the sides of the device, pressing to see if the plastic is thinner and more flexible at any point. Press hard when you find the spot and insert a small screwdriver to keep the clip open, using the minimum force.

2. On the other side of the device, there will be either a tongue fitting into a slot, in which case the two parts have already parted, or a similar bendy clip as the one you have a screwdriver marking directly opposite. Insert another small screwdriver to press the clip inwards.

3. Refitting is the reversal of this procedure, with the two parts clipping together with minimum force against the weak battery spring.

Good luck.


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General Technical / Re: Cateye wireless battery replacement
« Last post by Matt2matt2002 on May 23, 2026, 10:16:03 PM »
Quote from: mickeg on May 23, 2026, 08:18:56 PM
An inner cover and an outer cover?  Inner cover, I would expect it to have a slot if it is supposed to be rotated, or an arm that sticks out to one side.

If you have the model number, perhaps the instructions are out on the internet?
Thanks Mick
The picture shows the outer cover removed. It's below the main body.
The cover for the battery won't come off. There is no groove for a screwdriver blade. And nothing to grip the cover with.
Very frustrating.
I don't have the model number to hand but do have the printed instructions that came with the unit.
The instructions don't make it clear how to remove the battery.

Thanks for your comments
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General Technical / Re: Cateye wireless battery replacement
« Last post by mickeg on May 23, 2026, 08:18:56 PM »
An inner cover and an outer cover?  Inner cover, I would expect it to have a slot if it is supposed to be rotated, or an arm that sticks out to one side.

If you have the model number, perhaps the instructions are out on the internet?
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General Technical / Re: Cateye wireless battery replacement
« Last post by UKTony on May 23, 2026, 07:56:53 PM »
Not familiar with this type as I use a wired  basic Cateye 7 which only has one battery in the display unit.  If there’s no slot for a coin/ screwdriver maybe, and it’s just a maybe, try pushing the battery cover down and twisting anti clockwise abit like those childproof bottle tops which you press down then twist to unlock. Hope that make sense.
Cheers
Tony
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General Technical / Cateye wireless battery replacement
« Last post by Matt2matt2002 on May 23, 2026, 06:13:17 PM »
Hi folks.
Last month I replaced the battery in the wheel sensor and today there's a blank screen on the main body.

I removed the outer cover but cannot flip off the cover over the battery itself.
I've tried unscrewing it but there's nothing to grab/ grip.
Nowhere for a screwdriver to fit in.

I hope the picture explains my situation.

I think old age has worked it's magic.

Any thoughts or tips much appreciated.

Matt
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