2x DDR2 or DDR3 DIMM slots (model dependent), max 4GB. Chipset: Intel G31 or G41 Northbridge + ICH7 Southbridge. Expansion: 1x PCIe x16, 1x PCIe x1, 2x PCI.
Most motherboards labeled N15235 from the 2021-relevant legacy market share these core traits: foxconn n15235 motherboard manual pdf 2021
Since the manual is elusive, here are the vital specs you likely need right now: 2x DDR2 or DDR3 DIMM slots (model dependent), max 4GB
A: According to the board layout diagram (page 11 of the manual), the CR2032 battery is located between the PCIe x16 slot and the rear I/O panel, partially under the last PCI slot. 1x PCIe x1