> For the complete documentation index, see [llms.txt](https://polketio.gitbook.io/toearnfun/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://polketio.gitbook.io/toearnfun/guide/gamefi-system/battery.md).

# Battery

The power range is from 0% to 100%. For every energy consumed, 1% of the power will be deducted. When the power is 0%, the VFE will be damaged and cannot be repaired by charging. The durability and level of VFE affect the charging cost, and the charging `FUN` cost formula for each point of energy consumed is as follows:

$$FUN\_{cost} = (\frac {E\_{base}+S\_{base}+L\_{base}+D\_{base}} 2+(\frac {E+S+L+D} {4 \* D})^2\*Lv) \* N \* B$$