About this replacement
Gardena Water Computer — 7.4V Li-ion Replacement Battery
This 7.4V, 800mAh lithium-ion battery replaces part 01866-00.600.02 in the Gardena C1060 Plus Solar water computer. The C1060 Plus Solar is a programmable garden watering timer that uses a solar cell to keep this internal battery charged. When the solar cell degrades or the battery loses capacity, watering schedules stop holding — this replacement restores normal operation.
- C1060 Plus Solar compatibility: The C1060 Plus Solar uses a 7.4V two-cell Li-ion configuration with a built-in BMS to manage solar input and protect the controller's logic board from voltage spikes.
- Bench tested on actual hardware: We ran full charge and discharge cycles — the BMS held voltage steady under load and triggered the low-voltage cutoff cleanly without sagging into the controller's operating threshold.
- First charge after install: Place the water computer in direct sunlight for a full day before programming schedules — this gives the solar cell a clean baseline charge cycle on the new battery cells.
How the solar charging circuit interacts with this battery
The C1060 Plus Solar doesn't use mains power — the solar panel trickle-charges this battery continuously during daylight. The BMS inside this pack regulates incoming voltage from the panel, preventing overcharge. At 5.92Wh total capacity, the pack is sized to hold enough charge through overcast days without stressing the cells during extended sun exposure.
Watering schedule resets after battery swap — here's why
Removing the battery cuts power to the controller's memory entirely. All programmed watering cycles, start times, and durations will be wiped. Before removing the old battery, photograph or note down every schedule setting. After fitting the new battery and completing the initial solar charge, reprogram all schedules from scratch before relying on the timer.