Founded in 2002, Wuhan Fanso Technology Co., Ltd. is one of the largest manufacturers of spiral high-voltage lithium batteries. The company has a strong R&D team engaged in research into the primary lithium battery for over 30 years. The company has an ISO9001 quality management system certificate. Fanso products have UL, CE, Rohs, MA, UN and many other certificates.
| Model | Voltage (V) | Nominal capacity (Ah) | Nominal current (mA) | Max. impulse current (mA) | Dimension | Datasheet | |
| ER14505M | AA | 3,6 | 2,2 | 400 | 1000 | ø 14,50×50,50 |  Download |
| ER18505M | A | 3,6 | 3,5 | 1000 | 2000 | ø 18,50×50,50 | Download |
| ER26500M | C | 3,6 | 6 | 1500 | 2500 | ø 26,20×50,00 | Download |
| ER34615M | D | 3,6 | 14 | 1800 | 3500 | ø 34,20×61,50 | Download |