The battery on Neo motherboards is rechargeable - do not, I repeat: DO NOT install a non rechargeable CR2032 onto a Neo motherboard without first disabling the recharge circuit by removing the resistor next to the battery (there are pictures to point this out, I don't have one on my phone)
If you install a non rechargeable battery and leave the charging circuit active, it will heat up and explode and completely destroy your Neo board or worse if you're anywhere near it
You can get the rechargeable CR2032 batteries from specialist battery suppliers, Element14/Farnell, RS etc