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BQ25792: BQ25792 Charge query

Part Number: BQ25792


The customer design with BQ25792, and set the charging current 1.5A, when the battery is 3V, then start to charge, but charge current sometimes100mA, sometimes 300mA, sometimes 1.5A.

Attached the register setting:

REG00 0x04
  REG01 0x1A4
  REG03 0x96
  REG05 0x2F
  REG06 0x12C
  REG08 0xC3
  REG09 0x05
  REG0A 0x23
  REG0B 0xDC
  REG0D 0xBB
  REG0E 0x39
  REG0F 0x22
  REG10 0x80
  REG13 0x01
  REG14 0x1E
  REG17 0x7A
  REG18 0x14

Schematic as below:

The waveform as below:

1. Battery voltage 3.1V:  ch1:VSYS   ch2:Vbat  ch3:Ibat

2, When the battery voltage is charged to 3.16V,  change a battery with 4.1V to confirm the charging current, the waveform is as follows:

3, Re-insert the battery that has just been charged to 3.16V, the charging current is 1.46A, repeatedly plugging in and out the USB and the battery, the charging current is always about 1.5A, there is no abnormality, at this time the VSYS voltage is about 4.2V

Please give some suggestion with this query.