Yes lol, but it's ridiculously safer than those coin cells. No acid in it, the current is low so it won't cause burns, which eliminate the two main "battery" harms especially if they become obstructed.

The issue would be the body can absorb elemental nickel, so if it breached a small percent of it is sticking around, and with a 100 year half-life it's never leaving.

But eating a nuclear battery every month would probably be safer from a cancer perspective than living anywhere near the emission cloud of a coal plant.