Gardena Sileno battery rebuilding in Riga — SATER
SATER rebuilds 18V Li-ion battery packs for Gardena Sileno robotic mowers using premium SONY, MOLICEL, SAMSUNG and PANASONIC cells. We have been working at Silmachu iela 6 since 1993 — over 30 years of experience in electronics and battery technology. We open the sealed battery pack, replace the cells, fit a new BMS, balance and test. The result is restored capacity at a fraction of the OEM battery price, backed by a 6-month warranty.
Popular models we repair
- Sileno City 250
- Sileno City 500
- Sileno Life 750
- Sileno Life 1000
- Sileno Life 1250
- Sileno Minimo 250
- Sileno Minimo 500
- SMART Sileno
Common problems we fix
- Battery capacity loss after 2–3 seasons — noticeably reduced runtime
- Mower will not charge or charging station does not recognise the robot
- Reduced mowing time — robot returns to base too early
- Error LED patterns — blinking codes indicate battery or BMS fault
- Robot will not start after winter storage
- Charging loop — robot starts and stops charging repeatedly
- Cell imbalance — battery drains quickly despite showing full charge
- Corroded battery connector — poor contact or intermittent power loss
Detailed problem guides
Pick a symptom — we walk through the causes, what you can check yourself, and when to bring it in.
- Will not chargeRobot vacuum will not charge or find its dock — repair in Riga
- Spins in placeRobot vacuum spins in circles or gets stuck — repair in Riga
- Navigation errorRobot navigation error — LiDAR or camera failure, repair in Riga
- Brush not spinningRobot brush not spinning — main and side brush repair in Riga
- Won't turn onRobot vacuum won't turn on — repair in Riga
- Weak suctionRobot vacuum weak suction — diagnostics and repair in Riga
- Loud noiseRobot vacuum making loud or unusual noise — diagnostics and repair in Riga
- Wi-Fi / app errorRobot vacuum won't connect to Wi-Fi or app — diagnostics and repair in Riga
Gardena Sileno battery rebuilding
Gardena Sileno robotic mowers use 18V Li-ion battery packs — the same Husqvarna Group platform found in Automower models. Over time, lithium cell capacity naturally declines, especially after 2–3 active seasons and winter storage periods. An OEM replacement battery from Gardena often costs 120–200 EUR, but that is not always necessary.
At SATER on Silmachu iela 6 we open the sealed battery pack, remove the worn cells and fit new premium SONY, MOLICEL, SAMSUNG or PANASONIC cells. Each cell is individually tested and matched by internal resistance and capacity. After cell replacement we install a new BMS (battery management system) that ensures correct charging, discharging and cell balancing. Finally, the battery is fully charged and put through a load test to confirm that the rebuilt pack meets or exceeds factory specifications. All battery work carries a 6-month warranty.
Seasonal maintenance and battery lifespan
Winter storage is the critical moment for a Gardena Sileno battery. If the robot is left with a fully discharged battery in a cold garage, the lithium cells can degrade irreversibly — a cell loses capacity or fails entirely. We recommend storing the robot in a dry room at 5–15 °C with the charge level at around 50–70 %. In spring, before the first mow, it is advisable to run one full charge-discharge cycle.
If your Gardena Sileno shows blinking LED codes, drains quickly or will not charge at all, these are typical signs of cell degradation or BMS failure. A charging loop (the robot begins charging and stops after a few minutes) usually points to one or more damaged cells causing cell imbalance. A corroded connector between the battery and the robot can cause intermittent power loss and sporadic errors. All of these problems are repairable — and a battery rebuild at SATER costs significantly less than a new OEM pack. Call +371 67377002 or visit us at Silmachu iela 6, Riga.
Pricing & warranty
Fast on-site diagnostics. Repair price quoted after inspection. Repair warranty: 3 months. Battery replacement warranty: 6 months.
If the repair cost changes during the process, the technician will call to agree on the new price. No work is done without your consent.
Frequently asked questions
Why customers choose SATER
- Dedicated specialist per category. Your device is repaired by an engineer who only handles this device category — never others.
- 30+ years of experience. The service centre has been operating since 1993.
- On-site diagnostics. Diagnostics are free even if you decide not to proceed with the repair.
- Custom-built batteries. We don't just replace batteries — we build custom packs from SONY, MOLICEL, SAMSUNG, LG and PANASONIC cells.
- We serve all of Latvia. Our service centre is in Riga and we accept devices from anywhere in the country.