I found this jig saw from Japan recycle shop. This jigsaw was thrown away for 2 reasons, the battery and the motor engine. The battery is almost dead and the DC motor don't work. In this video, I rebuild the battery with cells and I repaired the DC motor.

SPECIFICATIONS
Model CJ14DSL
Voltage 14.4 V
Max. Cutting Depth Wood 135 mm Mild Steel 10 mm
NoLoad Speed 0 – 2400 min 1
Stroke 26 mm
Min. Cutting Radius 25 mm
Rechargeable battery BSL1430: Liion 14.4 V(3.0 Ah, 8 cells)
Weigh 2.3 kg

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