Battery dies quickly — diagnostics and rebuild in Riga
If your device's battery used to last an hour or more but now drains in just a few minutes or even seconds, the most common causes are natural cell degradation after hundreds of charge cycles, a single weak cell group dragging down the pack voltage, or a device-side fault causing abnormal current draw.
At the SATER service centre on Silmacu iela 6, we have been diagnosing batteries with laboratory equipment for over 30 years. Our technicians measure each cell's voltage, internal resistance, and capacity to pinpoint exactly which cells have degraded and whether the battery can be rebuilt. For rebuilds we use premium SONY, MOLICEL, SAMSUNG, LG, and PANASONIC cells. After cell replacement we calibrate the BMS and run a full capacity test to confirm the battery once again delivers factory-spec runtime. All battery work comes with a 6-month warranty. We also test the device itself to rule out a device-side fault as the cause of excessive current draw — because the battery is not always to blame. Bring your device to Silmacu iela 6 — we will give you an honest assessment and recommendation. Reduced runtime is the single most common complaint we hear about batteries. Clients often live with the problem for months until the device becomes practically unusable. However, the longer a battery is used in a degraded state, the greater the risk that damaged cells will affect the remaining healthy ones. We recommend visiting us as soon as you notice a significant drop in runtime — early diagnostics often means replacing just a few cells rather than the entire pack.
Likely causes
- Natural cell degradation after 500–800 charge cycles — Lithium-ion cells have a finite cycle life — typically 500 to 800 full cycles depending on cell quality and usage conditions. Beyond this threshold, internal resistance rises, capacity drops, and the battery can no longer deliver factory-spec runtime. This is natural ageing that cannot be prevented but can be resolved by replacing the cells.
- One cell group weak — drags the pack voltage down — In a battery pack, cells are connected in groups. If one group has degraded faster than the rest (due to manufacturing variation or localised overheating), it becomes the weak link. This group discharges faster, and the BMS shuts down the entire battery as soon as the weakest group's voltage drops below the minimum — even if the other groups are still half full. The result is a dramatic reduction in runtime.
- High self-discharge — cell micro-shorts — Degraded cells can develop internal micro-short circuits that cause elevated self-discharge. The battery loses charge even when the device is not in use. The owner notices that a fully charged battery shows only 50–70% the next day. This condition can also be dangerous, as micro-shorts can progress and cause overheating.
- Device draws abnormal current — device fault, not battery — The battery is not always at fault. If the device motor is worn, its bearings are seized, or the electronic control board is faulty, the device may draw two to three times more current than intended. The battery drains quickly but is itself perfectly healthy. We always measure device current draw to rule out this cause before proceeding with battery replacement.
- Temperature damage — stored too hot or too cold — Lithium-ion cells are sensitive to extreme temperatures. Storage in a hot car in summer (above 45°C) or in an unheated garage in winter (below -20°C) can irreversibly damage the internal cell structure, reducing capacity by 20–50% in a single season. Externally the battery looks normal, but its actual capacity has dropped dramatically.
What you can check yourself
- Time the actual runtime and compare it with the manufacturer's specification — if runtime is less than 50% of the rated figure, the battery has degraded.
- Check whether the battery indicator is accurate — sometimes the indicator is uncalibrated and shows 100% even though actual capacity is much lower.
- Try the device in a reduced power mode to compare — if runtime improves significantly, the problem may be on the device side (e.g., a worn motor drawing more current).
- Feel for unusual heat during use — excessive warmth indicates elevated internal resistance or cell degradation.
- Check the device for unusual behaviour — louder motor noise, vibration, or strange sounds may point to a device fault causing excessive current draw.
When to bring it in
If battery runtime has dropped by more than 40–50% compared to the original spec, it is time to bring it to the SATER service centre at Silmacu iela 6. It is especially important to visit us if the battery gets very hot during use or charging, if the device suddenly shuts off with 20–30% showing on the indicator, or if the battery is visibly swollen. We perform a full cell-level diagnostic, agree on a cost estimate, and provide a 6-month warranty on all battery work. Call +371 67377002.
Battery replacement warranty: 6 months.
Affected brands
Frequently asked questions
Why customers choose SATER
- Custom-built battery assemblies. We design and assemble packs for the exact device — no 'close enough' substitutes.
- Sony, Samsung, LG, Panasonic, Molicel cells. Only top-tier cells — each one capacity-tested before assembly.
- Batteries for robots, power tools, laptops. We build packs for any device that runs on lithium batteries.
- 30+ years of experience. The service centre has been operating since 1993.
- We serve all of Latvia. Our service centre is in Riga and we accept devices from anywhere in the country.