A grade cells

1. A-grade cells is with QR code to check when it was produced and which brand it is

2. Some factories used cells that is over 1 years,(Normally, you should choose inventory in 3 months)

3. You know,Even for Grade‑A cells, there are big differences. Some Grade‑A cells only reach 1500 cycles, while others can achieve 4000 cycles.

4.Using bursar and nuts to connect the cells