Amp meter can only be connected to 5v input end of the module
It is better that the charging current is 37% of the battery capacity. If you charge to the battery of 1000mAH, current of 400 is enough.
The connection wire should not be too thick.
Make sure the connect point is good.
If the input voltage is too high, like 5.2v, the current will be less than 1000mA, it is normal. This is a protection function, automatic reduction of the charging current to avoid amage to chip.
NO reverse polarity
Package Content:
5pcs of TP4056 5V Micro USB 1A Lithium Battery Charging Board Charger Module