biwecity currently has multiple listings for a 36V Li-Ion battery
charger. One example is item 322458751129. All have the same
listing illustration and description as a 42V 2A charger for
An observant purchaser could probably note irregularities in the
product's labeling, but this is not unusual in off-shore sourced
Unfortunately, the items shipped may not even resemble the image
The shipped device is actually a ~27W charger built around a
typical applications circuit using the Kintago KTG7838 off-
line controller IC:
Actual load profile is characteristic of the application circuit:
As constructed, it cannot even be guaranteed to start up
below about 140V, due to the device's start-up current spec
and the selection of trickle-feed resistor value.
The unit tested here actually failed during the record (the
zeros in the table and graph), with the chip assuming a low
fixed impedance on it's supply pin.
If what you need is an ~80W device, don't bother with this one.
I'm sure that the seller, biwecity offers some excellent deals
on other components, but they are unable to deliver on this one.