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gtr4000

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GTR4000 Memory Error

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I have a GTR4000 that has been stored for a couple of years and now that I've dug it out again, it is now giving me memory error that would indicate the chip with the internal battery is dead.  Not surprising given its age.  I looked for a BQ4013YMA-120, but it seems to be discontinued and I can't seem to find one from a reliable source other than Chinese sellers on eBay.

Should I trust putting one of these (probably knock-off) chips in my 4000?  Is there are compatible replacement chip that is currently being manufactured that would work?

thanks in advance!

Clement