How Do IP Ratings Work and How Should I Choose One for a Battery?

An IP (Ingress Protection) rating describes how well an enclosure resists solid objects and water. It is common to see IP67 or IP68 on outdoor, wearable or medical battery packs.

Reading the Two Digits

The first digit (0-6) rates protection against solids like dust; 6 means dust-tight. The second digit (0-9) rates water: 7 means temporary immersion in up to 1 m of water, while 8 means continuous immersion under conditions specified by the manufacturer. Higher is not automatically better — it must match the actual use.

How It Is Achieved

In a battery pack, IP protection comes from sealed enclosures, potting compound, sealed connectors and sealed charging ports. Every seam and connector is a potential leak path.

How to Choose

IP54 or IP65 suits splashes and dust in everyday devices; IP67 or IP68 is justified for wearable, outdoor or wash-down equipment. Over-specifying raises cost and thickness without real benefit, so define the exposure scenario first.

Remember that the rating applies to the complete finished pack, not a bare cell: a fully sealed enclosure with open connectors will not hold its IP rating in real use.