Battery drains fast — diagnostics and repair in Riga
If your device's battery drains significantly faster than it used to — the device shuts down after a short run time, the charge percentage drops unevenly, or the battery goes flat even in standby — the most common causes are parasitic drain from device electronics, one or more cells with a high self-discharge rate, BMS current leak, a firmware bug keeping components awake, or aged cells whose actual capacity is far below what the gauge reports.
At the SATER service centre on Silmacu iela 6, we have been diagnosing battery current leaks and capacity problems for over 30 years. Accelerated drain is one of the most complex battery issues because it can have multiple simultaneous causes. Our technicians use precision current measurement instruments (micro-amp range) to determine whether the elevated consumption originates from the battery itself (cell self-discharge, BMS leak) or from the device side (processor not entering sleep mode, sensor drawing current continuously). We measure each cell's voltage, internal resistance, and run a full capacity test with a calibrated load — this lets us precisely determine the actual capacity in mAh and compare it against the rated specifications. If cells have degraded, we replace them with premium SONY, MOLICEL, SAMSUNG, LG, or PANASONIC cells that deliver maximum capacity and minimal self-discharge. After cell replacement we calibrate the BMS and run a full charge-discharge cycle test to confirm the battery delivers run time matching the factory specification. We also check the device itself to rule out a firmware bug or hardware defect as the source of parasitic consumption. All battery work comes with a 6-month warranty. Bring your device to Silmacu iela 6 — we will pinpoint the exact cause of drain and propose the optimal solution.
Likely causes
- Parasitic drain from device electronics — The device's electronic circuits can draw current even when the device appears to be off or in standby. A faulty power management IC (PMIC), a board-level short circuit, or a leaking capacitor can create a constant parasitic current in the 10-100 mA range that drains the battery in a few hours. We measure standby current with a precision ammeter and identify the source of the leak.
- One or more cells with high self-discharge rate — Degraded lithium-ion cells can develop internal micro-short circuits due to dendrite formation. Such a cell loses charge on its own, even with no load connected. If one high-self-discharge cell is connected in series with healthy cells in a battery pack, the pack voltage drops unevenly and the BMS shuts the battery down prematurely. The actual capacity may be normal, but the run time is significantly reduced.
- BMS current leak — management circuit drawing excessive current — The BMS itself draws a small current to maintain its monitoring processes. Normally this is in the micro-amp range, but if a BMS component fails — for example, a leaky MOSFET or a degraded regulator — consumption can rise to milliamps. The battery gradually discharges even when the device is not connected or is fully powered off.
- Firmware bug keeping components awake — The device firmware controls which components are powered down or switched to a low-power state when they are not needed. A firmware bug can prevent the Wi-Fi module, a sensor, or the processor from entering sleep mode, causing continuously elevated current draw. The problem can appear or disappear after a firmware update. We diagnose current consumption in each operating mode.
- Aged cells with reduced actual capacity vs reported — After 500-800 charge cycles, lithium-ion cell capacity gradually declines, but the BMS often continues to report the original rated capacity. The device shows 100 percent charge, but the cells actually hold only 40-60 percent of the original energy. As a result, a seemingly full battery drains surprisingly fast. A capacity test with a calibrated load can only be performed at a service centre.
What you can check yourself
- Fully charge the battery and measure the actual run time — compare it with the manufacturer's specification. If run time is less than 50 percent of the rated value, the problem is real.
- Check for background apps or processes drawing current — sometimes a single forgotten app can double the consumption.
- If a firmware update is available for your device, install the latest version — manufacturers frequently fix power management bugs.
- Try switching the device fully off (not standby) and leaving it for 24 hours — if the battery loses more than 5-10 percent charge, cell self-discharge or BMS leakage is likely.
When to bring it in
If after updating firmware and performing simple checks the battery still drains too fast, it is time to bring it to the SATER service centre at Silmacu iela 6. We will run a precise capacity test, diagnose current leakage, and determine whether the problem lies in the battery or the device. We agree on a cost estimate before starting work, and all battery repairs come with a 6-month warranty. 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.