Why do EV’s require less power when charged when the battery is around 80 per cent full?

Explain why high current loads are possible with DC charging compared to AC charging for EV battery recharging. 

For a generic BMS system

1. What are the inputs

2. What are the outputs

Use to monitor battery health and performance

Explain the need and difference between active and passive cell balancing 

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Using a lead-acid car starter battery of 62Ah. I discharge underload at a 0.25C rating.

1. What is the theoretical available amperage are 0.25C?
2. What is the theoretical max discharge time in minutes?

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I have a lithium 5000 mAh battery. I discharge underload - at 1.5C rating 

1. What is the theoretical available amperage at 1.5C
2. What is the theoretical max-discharge time in minutes.

i) Why is there a need for ‘Discharge termination voltage'?

ii) The term ‘Recommended discharge current: 1C 2.9A’  - What is it and what does it mean?  

iii) Suggest a reason why  'Measured energy (Wh)' (marked in yellow) decreases from left to right? 

iv) The term `PCB protection trip current (A)´ - What is it and why is it important?

A light drawing 4 watts will use approx. 2A current draw. 

• State

  the theoretical full runtime capacity (Wh) to the protection voltage.

• If the light can only maintain full brightness to 3.5v.

  Calculate the approx.' runtime when the light starts to fade.

What C-rate C/5 represent in time