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|-
| Blinks slowly - Shutting down"
|}
==Fuel gauge - LED Indicator==
Operation of Discharging
{| class="wikitable collapsible collapsed"
! Capacity C (%) !! D1 !! D2 !! D3 !! D4
|-
| C ≥75% || ON || ON || ON || ON
|-
| 50%≤C＜75% || ON || ON || ON || OFF
|-
| 25%≤C＜50% || ON || ON || OFF || OFF
|-
| 3%≤C＜25% || ON || OFF || OFF || OFF
|-
| 0%＜C＜3% || Flashing || OFF || OFF || OFF
|}
Operation of charging
{| class="wikitable collapsible collapsed"
! Capacity C (%) !! D1 !! D2 !! D3 !! D4
|-
| Fully charged || ON || ON || ON || ON
|-
| 75%≤C || ON || ON || ON || Flashing
|-
| 50%≤C＜75% || ON || ON || Flashing || OFF
|-
| 25%≤C＜50% || ON || Flashing || OFF || OFF
|-
| C＜25% || Flashing || OFF || OFF || OFF
|}
==Pins and GPIO used==
{| class="wikitable collapsible collapsed"
! Pin No. !! Usage
|-
| 2, 4 || +5V power supply
|-
| 3, 5 || I2C for RTC and battery fuel-gauge systems
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| 6 || Ground
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| 29 || GPIO5 for power management
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| 32 || GPIO12 for power management
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| 33 || GPIO13 for power management
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| 31 || GPIO6 for AC power loss detection (Jumper for PLD inserted, High=power loss,Low=Power supply normal)
|}
==18650 battery dimension==
[[File:18650size.png]]
<span style="color:red;">Do not use 18650 battery with built-in protection circuit</span>
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