Motor Mover Remote

[otherclive]

I would look at using These

That’s a good cheap option. Gives the chance to make good if first attempt at using them hits problems.

 

[borderbilly]

When you get it up and running, I would get into the habit of removing battery's when not in use.

 

[Annie3]

Only attempt this if you are confident,

The white residue from the battery can be cleaned of using white vinegar I recommend using kitchen gloves and avoid breathing any of the fumes that might arise. This will froth up when it contacts the deposits and it may need some help from a small paint brush to help remove more stubborn deposits.
Provided all the copper tracks are intact on the pcb, there is a fair chance this will restore the function of the circuit, but its possible the electroplated nickel silver coloured plating on the battery contacts and springs may be lost. I have used solder tinning to replace some with success.

The circuit will need to be thoroughly washed off afterwards, and dried thoroughly. I find if you can set your oven to about 50 C, that will dry most circuit boards in about 30 mins. I have also used the dehydration cycle in my air fryer set to 50C Alternatively as Dusty has suggested leaving the PCB in the airing cupboard over night will also probably dry it of adequately.

On sensitive circuits I will usually add a sprayed conformal coating to protect the PCB but not on the battery contacts.

Thankyou for this much appreciated Annie

Not the best method, but in the past I have simply used an emery board to clean the contacts and it has always worked for me.

thank you Annie