T23 Battery not charging, strange battery/charger behavior

I have an old T23. Two months ago it suddenly stopped charging the battery. It seems as an IC problem. Therefore, I decided to buy an external battery charger (ThinkPad Multiple Battery Charger II, P/N: 22P9040), and a new battery, since the old one could drive the T23 for less than, say, 15 minutes.
After receiving the charger and a new battery (from two different suppliers in USA), I found a strange problem: the old battery is charging normally, but operates for 15 minutes, or less, and the new one is not charging - the orange light flashes permanently.
After that, I decided to buy another new battery, this time from Hong Kong, but the whole story repeated.
Any suggestions? Thanks in advance.

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