Greetings
I have recently acquired an Einhell 7.2V (Ni-Cd) cordless drill with a battery charger.
The (only) diode had been removed and was loose.
I have attached a reverse-engineered schematic as well as a pic of the little board.
There is a white arrow where the diode goes, but I am still unsure as to the direction/polarity, as I am not sure
whether it is forward- or reverse-biased.
Does anybody have any ideas please?

Also, it seems that the green led which should indicate a full-charged status will aways be on?

Thank you
Max

 

1N4001 diode must be forward biased as in B. This branch of the circuit provides the charging current.
GREEN LED stays ON all the time.
RED LED stays ON while charging. Goes OFF when battery is charged.

 

1N4001 diode must be forward biased as in B. This branch of the circuit provides the charging current.
GREEN LED stays ON all the time.
RED LED stays ON while charging. Goes OFF when battery is charged.

 

MrChips, my gratitude knows no bounds, thank you.
Max