I found some solder-able 6.3mm spade plugs that clip onto a 12V SLA 7.2Ahr Battery. The latest package didn't come with a rubber protective boot, so this is a design that provides such a protective boot.
Dimensions: 25mm long, 12mm wide, 6mm deep. Wire sleeve, internal: 3mm. Spade, internal: 10mm x 3mm.
SLA_Battery_Clip.9.spade-sleeve.stl | 655.7KB |