I like lowcost Timex Readers with the wonderful Indiglo luminous dial function. The batteries last a few years and are simple to replace. You can buy a similar Timex used on eBay for $10. My current Timex watch had stopped glowing when activated so I replaced the battery. I used a very small regular screwdriver to pry open the back by accessing the tiny lip marked on the back by a tiny pointer.
In the past, after I replaced the battery I was able to press the back of the watch in with my fingers and thumbs. It helps to add a little silicone grease on the gasket to make the back snap in place easier.
This particular time I did not have any silicone grease and replacing the watch back was very difficult. I ended up placing the watch on a stiff box on a table with some give to it and used a simple piece of wood to press uniformly on the back of the watch to snap it in place. You might try also a paperback book and a towel to rest the watch on to provide some give to keep the watch from being damaged when you are pressing the back on. But don't risk using this method with an expensive watch or if you have an alternative that is less risky.
Using this method risks breaking the crystal. If you go on Amazon you can buy lowcost watch presses for about $15 which will reduce the chance of ruining your crystal.
The silicon I usually use is silicon spray and I add it to the Q tip. Do not spray on the watch any lubricant. You can buy silicone grease also in a tube. Use it very sparingly, you do not want to gum up the watch, you only want to add a tiny amount to the gasket to aid in its realignment with the watch.
cr2016 battery https://amzn.to/3FCu8f2

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