HILTI TE 2-A 24V Rotary Hammer Restoration | Replace lithium battery

Hilti te 2-a 24V lightweight cordless hammer
The case is broken and the dust cap is missing. Only the battery box has no cells.
It was completely disassembled and cleaned, the front and rear bearings of the rotor were replaced, and the casing was repaired and reinforced.
The battery part uses 18650 lithium cells, two in parallel and seven in series, with a maximum voltage of 29.4V.
After repair, the function is intact and the power is strong.