TWA brick

Last time TWA showed battery 2.0V and shuted off.

After that I changed new battery but it did not open.

I'm sorry to learn that your TWA will no longer  power on.  

The first things to check are the battery tabs. The tabs on  the cover may become compressed after repeated battery changes.  
Please remove the battery cover and bend the tabs outward to make sure that they're making proper contact with the batteries inside.
While the cover is off, press down on the batteries inside the unit. These should feel like they're against a slightly springy surface.
If they feel like they're against a solid surface, these tabs may be compressed.
It's worth removing the batteries and looking inside to check for corrosion as well.
If the battery cover tabs don't make a difference and the batteries feel solid inside, reach out via email and I'd be happy to provide instruction for fixing internal tabs.

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