Text this: Lithium-ion (Li-ion) battery state of charge estimation

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| |/\| ||  | / \ || | // __     -| ||-  | |  \ || 
|  /\  ||  | \_/ || | \\_\ ||   _| ||_  | |__/ || 
|_// \_||   \___//   \____//   /_____// |_____//  
`-`   `-`   `---`     `---`    `-----`   -----`