CN3085 quadruple Ni-MH battery charger modification

It's 3202 years old and you still use only a transformer, diode and resistor for charging? What a joke!
 
 
Problems with the original charger:
1. Low charging current: Each group has a 1/4W resistor to limit the current. When four batteries are charged together, the current is less than 300mA.
2. Voltage range: Because the current is limited and charged directly after rectification by the transformer, so The voltage range can only be 220V, and the charging stop voltage is also affected by fluctuations in the mains power, let alone places with 110V mains power.
3. Waste of sockets: With such a small amount of current, I have to take up one of my slots?
There is no filtering yet, so pulse charging, right? [
 
 
 
 
Using CN3085 as the charging chip, one Taobao chip costs about 1 yuan with free shipping. The resistance, capacitance, and peripherals are all commonly used values. The package is 0603, and the total cost does not exceed 6 yuan.
Powered by TypeC. Try to choose a thin board for proofing, as long as you know how to do it, because the height of the original gap is different and it cannot be made on one board.
 
The maximum charging current of a single cell of this circuit is about 5V400mA. The peripheral resistance can be modified as needed (refer to the manual), as long as it does not exceed 1C. The total charging current is about 5V1A.
 
 
 
 
 
 
By the way, let’s test two batteries [
 
"Sony" nickel-metal hydride battery, nominal capacity 4600mAh, 4 pieces purchased at the seafood market for 10 yuan.
Double capacity nickel metal hydride battery, nominal capacity 1200mAh, Taobao purchased 4 pieces for 11 yuan.
I did not conduct a capacity test, but simply measured the internal resistance.
The Sony model certainly does not have the exaggerated capacity as advertised, but when the voltage is lower than the multiple, the internal resistance can be lower than the multiple. At least the Sony model is worth buying.