In electrochemistry, battery charge refers to the amount of electric energy that a battery can store or deliver during a discharge cycle. It is fundamentally linked to the movement of ions between the battery's anode and cathode through the electrolyte during the charging and discharging processes.

To find the battery charge time, use the following method:

1. Take the battery's capacity in Ah or mAh.

2. Combine it with the initial State of Charge (SoC) using the formula:

   Available capacity = Capacity × (1 - (SoC / 100))

3. Multiply the current by the battery efficiency resulting in a charging current.

4. Divide available capacity by charging current.

5. Multiply the result by 60 to express the time in minutes.

To properly charge the lithium-ion batteries:

• Use the manufacturer’s charger or a compatible one.
• Avoid full discharges and keep the charge between 20%-80%.
• Charge in moderate temperatures (68-77 ºF / 20-25 ºC) and update firmware for optimized charging.
• Replace batteries when they show reduced capacity.