Why is the warranty different even for the “same” battery?
A real warranty means the supplier will replace a failed unit — and can actually do it from distance. Some suppliers offer a “10-year warranty” on paper but have no local support, no spare parts, and make you ship the dead battery back to China (which often costs more than the battery itself). A supplier with a real support chain may charge more upfront but the warranty is actually usable. Check: who honors it, and from where?
