#Goal

- Replace the 18650 battery holder with two edge-mounted THT battery pads on the project. Ensure the new pads are tied to VBAT and GND with corresponding +/- silkscreen markings, while maintaining the board size at 25.0 x 12.5 mm with a bottom GND pour and full ERC/DRC compliance.

#Implementation plan

1. Schematic modifications

1. Remove the 18650 battery holder symbol from the schematic.

2. Add two THT pads labeled BAT+ and BAT-.

3. Connect BAT+ to VBAT and BAT- to GND ensuring proper net assignments without unintended merges.

2. PCB layout adjustments

1. Remove any existing 18650 footprint if present.

2. Place two edge-mounted THT battery pads on the board edge with drill size of 1.2 mm and pad size of 2.4 mm.

3. Add silkscreen markings for + (next to BAT+) and - (next to BAT-) to clearly indicate battery orientation.

4. Confirm the board outline remains 25.0 x 12.5 mm and maintain a continuous GND pour on the bottom layer.

3. Verification and rules compliance

1. Ensure design rule settings: minimum trace width 0.2 mm, clearance 0.2 mm, power net widths 0.4 mm, via 0.3/0.6 mm.

2. Run ERC on the schematic to validate net connections and then DRC on the PCB layout to ensure there are no rule violations.

#Success criteria

- The schematic does not include the 18650 holder and now shows two THT pads for battery connection, with proper labeling on the silkscreen.

- The PCB layout retains the board outline of 25.0 x 12.5 mm with an intact bottom GND pour and correct pad dimensions.

- Both ERC and DRC checks run clear with no violations reported.