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.

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.

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.

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?

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