A battery mower is a major convenience upgrade, but it combines mechanical cutting loads with high-current electronics. Common issues include blade/spindle wear, self-propel drive components, battery degradation, and control boards that manage safety interlocks and power delivery.
Repair can make sense when the mower deck and motor are sound and the issue is mechanical (spindle, belt/drive) or a single battery under the threshold-especially early in ownership. Replacement is often better when the motor controller fails, multiple safety interlocks become unreliable, or the mower's runtime drops sharply and you'd need multiple new batteries to restore performance.
Also evaluate your mowing conditions: thick grass, hills, and frequent wet mowing accelerate wear. If a major electronics repair is quoted near the threshold, replacing can reduce future downtime during peak season.