Benq~Siemens battery repair/restoration

Good day everyone!

Could anyone direct me to a solution pretty please?

Benq~Siemens EF 81, bloated battery, totaled. I got the battery curcuit out, and replaced dead Li~Ion cell with a new one. But it does not work, phone only turns on when charger is plugged in, but stuck in loading mode with just Benq~Siemens brand logo there.

I found my cellphone on a junkyard, and i really want to restore it, it looks **** and robust. German technology in a nutshell!! If anyone could assist me with at least general direction… it would be greatly appreciated!!

Thanks in advance!
~xoxo

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