{"product_id":"kepure-aqex-stubborn-stamina-lf-ups-skirta-raspberry-pi","title":"Kepurė AQEX STUBBORN STAMINA LF UPS skirta Raspberry Pi","description":"\u003ch2\u003eTrumpai apie prekę\u003c\/h2\u003e\u003cp\u003ePrekė: Kepurė AQEX STUBBORN STAMINA LF UPS skirta Raspberry Pi. Kategorija: Priedai.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGamintojas:\u003c\/strong\u003e AQEX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModelis:\u003c\/strong\u003e AQEX\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eUltra-Durable Industrial LiFePo4 UPS HAT for Raspberry Pi\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eOfficial Product Page: https:\/\/aqex.eu\/stubborn-stamina-lf-raspberry-pi-lfp-ups-hat.html\u003c\/p\u003e\u003ch2\u003e1. Product Concept \u0026amp; Strategic Advantages\u003c\/h2\u003e\u003cp\u003eThe Stubborn Stamina LF is a high-reliability uninterruptible power supply specifically engineered for long-term industrial deployments. By utilizing LiFePo4 (Lithium Iron Phosphate) technology, it offers superior thermal stability and significantly higher cycle life compared to standard Li-ion solutions.\u003c\/p\u003e\u003cp\u003eThe device is available for purchase with or without a battery cell, allowing integrators to select the specific capacity required for their application.\u003c\/p\u003e\u003cp\u003eStrategic advantages: Industrial Longevity: LiFePo4 chemistry ensures thousands of charge cycles and superior thermal stability. Universal Battery Compatibility: Supports various single-cell (1S) form factors. The modular design allows the use of 18650, 26650, or 32700 cells with matching holders. Flexible Purchasing Options: Available as a standalone unit or bundled with a 26650 LiFePo4 battery as the current standard configuration. High Power Delivery: Specifically designed to handle the peak power demands of the Raspberry Pi 5 (up to 3.5A). * Extreme Reliability: Hardware protection including reverse polarity, deep discharge, and overcharge management.\u003c\/p\u003e\u003ch2\u003e2. Comprehensive Technical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eParameter, Value, Condition \/ Detailed Notes\u003c\/li\u003e\n\u003cli\u003eInput Voltage (USB-C), 5.0V – 5.2V, RPi 5 official power adapter compatible\u003c\/li\u003e\n\u003cli\u003eOutput Voltage, 5.0V DC, Precision regulated for Raspberry Pi\u003c\/li\u003e\n\u003cli\u003eMax Continuous Load, 3.5A, Enhanced current delivery for RPi 5 + Peripherals\u003c\/li\u003e\n\u003cli\u003eMax Battery Discharge, 7.5A, High-rate discharge capability\u003c\/li\u003e\n\u003cli\u003eCharging Current, 2A, Fast charging for 18650 LiFePo4 cells\u003c\/li\u003e\n\u003cli\u003eBattery Chemistry, LiFePo4 ONLY, Nominal: 3.2V \/ Charging: 3.6V\u003c\/li\u003e\n\u003cli\u003eSwitchover Time, 100 – 300 μs, No-reboot guaranteed transition\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u0026gt; Design Note: The Offline topology ensures almost zero power loss and heat generation during standard operation. A momentary (\u0026lt;1ms) voltage transient occurs during power failure; however, the Raspberry Pi's internal regulation easily filters this, ensuring zero system instability or reboot.\u003c\/p\u003e\u003ch2\u003e3. qUPS-P-SC User Interfaces and Indicators\u003c\/h2\u003e\u003ch2\u003e4. Battery Management \u0026amp; Protection\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFeature:\u003c\/b\u003e Specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProtection Circuit:\u003c\/b\u003e Deep discharge, Overcharge, Reverse Polarity\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThermal Monitoring:\u003c\/b\u003e Optional NTC connector (5) for temperature-aware charging\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCharging Cut-off:\u003c\/b\u003e Integrated hardware-level voltage monitoring\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eLow Battery Limit:\u003c\/b\u003e Automatic load disconnection at critical voltage\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u0026gt; Warning: Use only LiFePo4 cells. Connecting standard 3.7V Li-ion batteries may result in incomplete charging or circuit mismatch.\u003c\/p\u003e\u003ch2\u003e5. User Interfaces \u0026amp; Configuration\u003c\/h2\u003e\u003cp\u003e\u003cb\u003e5.1 Mode Selection (Switch 4)\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOFF: Complete power cut.\u003c\/li\u003e\n\u003cli\u003eON: Immediate power-up when power (battery or external) is available.\u003c\/li\u003e\n\u003cli\u003eAUTO: Intelligent start-up logic; only boots the Pi when the battery reaches the \"Min\" energy level.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003e5.2 GPIO Communication\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eThe system utilizes a 3-pin GPIO interface for OS-level integration. The following pins are used on the 40-pin Raspberry Pi header:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePFO (Power Fail): GPIO 17 (Pin 11) — Signals external power loss (HIGH = OK \/ LOW = Backup Mode).\u003c\/li\u003e\n\u003cli\u003eLIM (Limit): GPIO 27 (Pin 13) — Signals that the battery has reached the critical low threshold.\u003c\/li\u003e\n\u003cli\u003eSHD (Shutdown): GPIO 22 (Pin 15) — Handshake signal. The UPS cuts power after the OS pulls this pin LOW (or the daemon signals a halt).\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e6. Visual Diagnostics (LED Indicators)\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLED, Color, Status \/ Meaning\u003c\/li\u003e\n\u003cli\u003eExternal Power (6), Green, Primary 5V power source detected.\u003c\/li\u003e\n\u003cli\u003eBad Polarity (9), Red, CRITICAL: Battery installed backwards!\u003c\/li\u003e\n\u003cli\u003eFull, Green, Battery fully charged (\u0026gt;3.5V).\u003c\/li\u003e\n\u003cli\u003eMin, Green, Sufficient energy for a safe boot-shutdown cycle.\u003c\/li\u003e\n\u003cli\u003eSafe, Yellow, Sufficient energy for a safe shutdown cycle.\u003c\/li\u003e\n\u003cli\u003eLow, Red, Critical level. Immediate shutdown required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e7. Intelligent Power Management (IPM)\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSafe-Start Logic: Prevents \"brown-out\" loops by ensuring the Pi only starts when the battery can support the peak current of the boot process.\u003c\/li\u003e\n\u003cli\u003eShutdown Guard: Monitors the Pi's state and ensures power is only cut after the operating system has safely unmounted the filesystem.\u003c\/li\u003e\n\u003cli\u003eInput Threshold Tuning: Onboard potentiometer allows adjustment for voltage drops caused by long input cables.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e8. Estimated Runtimes (4000mAh LiFePo4)\u003c\/h2\u003e\u003cp\u003e| Raspberry Pi Model | No Load [min] | 100% Load [min] | | :--- | :---: | :---: | :---: | | Raspberry Pi 2 | 535 | 285 | | Raspberry Pi 3 | 428 | 172 | | Raspberry Pi 4 | 413 | 124 | | Raspberry Pi 5 | 261 | 109 |\u003c\/p\u003e\u003cp\u003e*Note: Final runtimes are dependent on battery capacity, age, and ambient temperature.\u003c\/p\u003e\u003ch2\u003e9. Software Support\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003equps-guard: Native daemon for automated monitoring and safe shutdown.\u003c\/li\u003e\n\u003cli\u003eCompatibility: Fully compatible with Raspberry Pi OS (Debian-based).\u003c\/li\u003e\n\u003cli\u003eRepository: github.com\/aqexhu\/qups-guard\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eHW Version: 1.0 | Released: 2026\u003c\/p\u003e\u003cp\u003eManufacturer: AQEX Electronics | aqex.eu\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eGroup\u003c\/th\u003e\n\u003cth\u003eName\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003enew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eInvoice\u003c\/td\u003e\n\u003ctd\u003eWith VAT invoice\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eManufacturer code\u003c\/td\u003e\n\u003ctd\u003eAQEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAQEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eKind\u003c\/td\u003e\n\u003ctd\u003eExpansion board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eEAN (GTIN)\u003c\/td\u003e\n\u003ctd\u003e5999863807039\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003ePackaging status\u003c\/td\u003e\n\u003ctd\u003eoriginal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParametry\u003c\/td\u003e\n\u003ctd\u003eBatteries included\u003c\/td\u003e\n\u003ctd\u003eyes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"AQEX","offers":[{"title":"Default Title","offer_id":46153974644796,"sku":"18740819178","price":84.7,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/2161\/6188\/files\/AQEX-STUBBORN-STAMINA-LF-UPS-HAT-for-the-Pi.jpg?v=1789226627","url":"https:\/\/market365.lt\/products\/kepure-aqex-stubborn-stamina-lf-ups-skirta-raspberry-pi","provider":"Market365","version":"1.0","type":"link"}