I own a Worx drill and impact and it needs 20V battery to operate.
I removed the cover and inspected the internal pins of the Worx 20V battery.
Note, there are Orange and Green Worx, just designed for different market or countries, basically they are quite similar.
However, there could be many types of Worx 20V battery, mine is a 6 pins version as below:
– is Negative terminal
+ is Positive terminal
BH is for Battery enable / handshake (This is normally to inform the charger that the battery is connected)
BS is for Battery sense / ID line (Charger would use this pin to read the voltage or ID, perhaps to identify if this is original Worx battery before start charging)
Vcc is for Logic / reference voltage (from charger, to power the electronic components inside the battery and charger)
l or TH is Thermistor for temperature monitoring, it could stop the charging if the temperature is either too hot or too cold
C1 to C4 is junction between cell groups (There is no official marking on the battery, but I added this as these junctions are for battery charging balancing)
Worx 20V Battery Interface & Pinout Wiring Diagram
I draw the basic wiring diagram of the Worx 20V battery as above.
There are 18650 batteries inside, each cell or group (for higher size) give out around.
When connected in series, 5 pieces of 18650 battery output 20V.
– and + = 20V
– and l = 0V
+ and l = 20V
– and BH = 0V
+ and BH = 0V
– and Vcc = 0V (Zero because need to insert the battery to charger to power up electronics)
+ and Vcc = 0V (Same, zero before insert battery to the charger)
– and BS = 0V
+ and BS = 20V
– and C1 = 4V
– and C2 = 8V
– and C3 = 12V
– and C4 = 16V
– and l = 10 KΩ (25 °C), ~8 KΩ (Current Temp) I believe the thermistor is 10KΩ at 25 °C, due to the temperature when I was measuring the resistance value of the thermistor, it show around 8 KΩ
+ and l = 0 Ω
– and BH = 0 Ω
+ and BH = 0 Ω
– and Vcc = 0 Ω
+ and Vcc = 0 Ω
– and BS= 27 KΩ (Charger could read this to know the battery type)
+ and BS = 0 Ω
This battery is power share Lithium Iom 20V battery with model WA3575.
Yes, as mentioned, there are 6 pins for this battery model. Some Worx battery might only have 5 pins, check the bottom of your battery for the exact model.
I removed the battery cover and put it side by side as shown in the image above.
From here, you can clearly see that it consists 6 pins, namely -, l, BH, Vcc, Bs and +.
I have explained the function of each pin in the introduction of this article.
It use 5 pieces of 18650 battery connected in series as I mentioned before.
You might be wondering what is the “white gel” on the electronic board as shown in the image above.
It is actually a silicone sealant or thermal paste, mainly for protection of the battery.
I have reversed engineering the Worx 20 battery and draw the wiring diagram of this battery.
Your Worx 20V battery might be slight different, but check the label on each pin, it should have similar function.
