AEG QX9 change battery cells repair replace open battery pack disassemble

The old batteries are LG with 2100mah and 20A discharge current. The replacement cells are 2000mah with 20A discharge current. You can also use the Hofer battery packs which should have 2500 mAh.
What is important, however, is the discharge current that the battery can take off without being damaged. So please do not take below 20A.