> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/flex-2.0-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/flex-2.0-user-manual/getting-started/charging-flex.md).

# Charging FLEX

FLEX is charged and tested before shipping—so you can start using it straight away. 

### Charging the Battery

To maximize the use of your FLEX, we recommend fully charging its battery before taking recordings. If the ON/OFF LED is not blue when you turn your FLEX on, it requires charging. 

To charge the battery:

1. Plug the USB-C charging cable into the USB-C port.  
2. Then, connect the other end of the USB-C charging cable to a power outlet or your PC/Mac. 

The time it takes to recharge the battery fully depends on the remaining capacity of the lithium polymer battery. Charging can take up to four hours. Charging the battery is faster if you connect the FLEX Controller to a dedicated USB port. 

If your FLEX is unused for a long period of time, the battery may completely deplete of charge. If this happens, you may need to charge it for 24 hours. 

If you have any issues charging FLEX, please contact the EMOTIV Support team.  

###  FLEX Charging Behavior 

| **Charging**                                                                                                                                                                                      | **Charging Complete**                            |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
| When FLEX is charging, the orange LED is displayed.                                                                                                                                               | When FLEX is fully charged, the LED turns green. |
| ![](https://lh7-us.googleusercontent.com/1Axw4s74kb9cOjcqOYB1F2IrvpQdVvz93gIX7BSSG7DrFVqAIsREQsnYQNns6aW1C87L1pG3MbUCK28EPpe6SsloDbY81qzzuhCx359f4u8Ss2LZMAod-bfoUdu5eLzt0rCr0ashNq2FHZhKGSiq36Q) |                                                  |
|                                                                                                                                                                                                   |                                                  |


---

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