Which feature of Axonics SNM devices extends the interval between surgical replacements?

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The feature that extends the time between surgical replacements is the rechargeable internal battery designed for long life. This battery is inside the implant and is designed to store energy for many years, then be recharged regularly via an external charger without surgery. Because energy is replenished in place, the device can stay implanted longer before a replacement is needed. The other options don’t change how long the implant can operate between surgeries: a larger housing doesn’t increase battery life, a stronger external charger doesn’t add implant energy capacity, and a rechargeable external pack doesn’t replace the implanted energy store.