b42

Port	Details
	14INR22/71-4 Nominal voltage: 51.66V Maximum charge voltage: 58.8V Rated capacity: 18.3Ah Rated energy: 945.37Wh Maximum charge current: 9.2A Maximum discharge current: 36A Waterproof faceplate screws: 3x Security-Torx TX10 Lower mount bracket screws: 4x Security-Torx TX15 Under-lower-mount screws: 3x Security-Torx TX20 Shell screws: 10x Security-7-star TX20/25?

Pinout

┌─────────────────┐
│  +  │  4  │  -  │
│                 │
│  1  │  2  │  3  │
└─────────────────┘

Pin	Colour	Function
+	Red	Switched Pack Positive
-	Black	Pack Negative
1	Yellow	?
2	Green	?
3	Blue	?
4	White	~3.1V Logic/Signal

Measurements

Most likely cell configuration is 14S4P = 56 x 21700-class cells, 9A per parallel cell.