Panasonic Ni-Cd recgargeable battery life time and charging topology circuit

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Hi There,
I got a part of vacuam cleaner machine driven by DC charger. May be it was manufactured in 2018.
User might through it away because it was troubling.

9 pcs of P-130SCS 1.2V 1300mAh has joined togeter to get 1.2×9 Vdc.
20210315_160150-min.jpg




Basically it was using for drive a 9 v DC motor. Manufacturer recommended to plug it with 9V/300mA charger for use it 8 hrs, may be charging time was for 15 mins.

1. Does it risky to use this battery after a long time?
2.It may damaged?
3. How can I charge it with another way?
4. Take a look the charging and discharing circuit and battery bundle.


Recommend me any safe mode charing topology or particular circuit.
Hope you will help
 
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