Several Fox battery ranges have undergone hardware changes since their initial release and may therefore be available as different versions and/or with a different connector type. If you are looking to expand your storage capacity, please be mindful of the guidance provided below. For general guidance relating to battery expansion, see this article.
Mira HV25
The MIRA HV25 has only the one iteration and there are no compatibility issues to consider.
HV2600
If your system includes HV2600 batteries, you need to identify whether your Battery Management System (BMS) is Version 1 (V1) or Version 2 (V2). While both models remain in use, recent supply chain changes have led to compatibility challenges.
How to Identify Your HV2600 Battery Version
Some V1 batteries may be labelled as ‘Version C’ or ‘Version D,’ both of which are considered V1 and can be used together. The best way to check is by looking at the BMS serial number:
• Version 1 BMS Serial Number Prefix: 60 BBHV1
• Version 2 BMS Serial Number Prefix: 60 BBHV2
Battery serial number format prefix:
- Version 1 602H262
- Version 2 60QH262 or 60NH262
ECS/EQ Batteries
Earlier versions of the ECS battery range underwent hardware changes with different battery versions and battery connection types being in the market at the same time. Please refer to this chart for guidance:
| Battery Model | Version | Connector Type | Serial No. Ref |
| ECS2900 | |||
| Master | 1 | B | CM292 |
| Slave | 1 | B | CS292 |
| Master | 2 | B | TM292 |
| Slave | 2 | B | TS292 |
| Master | 2 | A | JM/KM/8M/QM292 |
| Slave | 2 | A | JS/KS/8S/QS292 |
| ECS4100 | |||
| Master | 1 | B | CM412 |
| Slave | 1 | B | CS412 |
| Master | 2 | B | LM412 |
| Slave | 2 | B | LS412 |
| ECS4300 | ECS4300/EQ4300 can be installed in same stack | ||
| Master | N/A | A | |
| Slave | N/A | A | |
| EQ4300 | N/A | A | |
| Master | N/A | A | |
| Slave | N/A | A | |
| ECS4800 | ECS4800/EQ4800 can be installed in same stack | ||
| Master | N/A | A | |
| Slave | N/A | A | |
| EQ4800 | N/A | A | |
| Master | N/A | A | |
| Slave | N/A | A | |

