Thanks Olgert for tips.
I found datasheet for BQ 74740. It`s: Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect
Available at: kr.ic-on-line.cn/IOL_BQ24740/PdfView/1220202.htm
As seen on datasheet there is direct link to Battery that is floating from +3.5V to 12V and back.
I`ll search for replacement and reply the result.
Thanks Olgert for tips.
I found datasheet for BQ 74740. It`s: Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect
Available at: kr.ic-on-line.cn/IOL_BQ24740/PdfView/1220202.htm
As seen on datasheet there is direct link to Battery that is floating from +3.5V to 12V and back.
I`ll search for replacement and reply the result.