Your battery may be a rare type (as compared to TH-55). Further complicating matters is whether or not there is a fresh batch available. I do hope someone gives a report on how the battery they bought turned out. I kinda stopped doing battery threads a year ago and only think that the TH-55 battery reports may still be the most recently updated.
There is one seller of TH-55 batteries here, but if you e-mail him he might give you a response on his opinion about TJ-27