Help to replace a coin cell battery with rechargeable battery and wireless charging coil

[JackAD]

Hi all

I am not an electronic engineer (hence this post). I have this circuit (designed by someone else) and I need to replace the battery holder (BT1, 3v) with a rechargeable battery and wireless charging coil (54 mm diameter max) to charge it with.

(btw, the J* components are just jumpers to allow traces to cross as this is a single layer board).

Is there anyone who would be kind enough to tell me how to do this? Recommend the components I need?

Thanks a lot!

 

[c_mitra]

You can safely replace the the indicated battery with two Ni-Cd or Ni-MH batteries in series and the charging coil in series with a diode connected across the battery. Select a suitable battery holder to mount the two cells (AA or AAA are very common and easily available) in series.

 

[JackAD]

You can safely replace the the indicated battery with two Ni-Cd or Ni-MH batteries in series and the charging coil in series with a diode connected across the battery. Select a suitable battery holder to mount the two cells (AA or AAA are very common and easily available) in series.

Thanks. When you say a "diode connected across the battery" - does that mean in parallel with the battery?

Any chance you could sketch it for me please?

How do I select the coil?

Thanks a lot!

 

[c_mitra]

No, the diode should be connected in series with the charging coil. It is needed so that the battery does not discharge into the coil when the charging power is not available.

The wireless charging coil should have the charging circuit - else you need to get a charging unit.