And here is a message from battery discussion in DX yahoo group supporting my opinion...

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My $0.02USD ...

I never use battery clips.  A brand new lithium battery, properly braised and soldered, should last at *least* 5-8 years as a RAM backup device, often much more.  I can get my local Batteries Plus to braise strips on any battery for $5 more than the cost of the cell, which seems reasonable to me.  Performing a replacement every say, 7 years seems like a simple, straightforward maintenance task.  Even if the original battery is no longer available, it should be possible to braise on strips such that the battery fits, and a piece of VHB tape will hold the battery in place without affecting the electronics.

During that same 5+ years, even a well-made battery clip with good contact pressure is subject to developing surface corrosion, causing the connection to fail, perhaps even multiple times.  Battery clips were designed for uses where the battery life is weeks or months, not multiple years.

YMMV.

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Daniel Forro