query: Simple, cheap "Nano-UPS" for 5V/<2A/<10W load (e.g. IP camera), based on 4xAAA batteries (or similar)
positive_passages.docid: 146478
positive_passages.text: USB and coin cell battery switching
negative_passages.docid: 95587
negative_passages.text: How can I safely prototype a mains power circuit?
negative_passages.docid: 88902
negative_passages.text: battery backup supply switch over design
negative_passages.docid: 18771
negative_passages.text: Switch between 5V power supplies?
negative_passages.docid: 114322
negative_passages.text: Making voltmeter accepting bipolar input voltage, using a microcontroller
negative_passages.docid: 14016
negative_passages.text: Least expensive way to boost DC voltage
negative_passages.docid: 7084
negative_passages.text: ADC for measuring 0-5V but connected to 3.3V device
negative_passages.docid: 83091
negative_passages.text: Draw power from a portable mobile charger to power circuits
negative_passages.docid: 100157
negative_passages.text: Running 2 5V USB battery power packs, Can I use them in parallel
negative_passages.docid: 23382
negative_passages.text: Need single-shot 1 minute delay-off LED circuit
negative_passages.docid: 85397
negative_passages.text: Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)
negative_passages.docid: 140532
negative_passages.text: LED as power generator
negative_passages.docid: 36841
negative_passages.text: Generating high voltage (100V+) from 5V USB supply
negative_passages.docid: 61713
negative_passages.text: Simple capacitor use for buffering a battery?
negative_passages.docid: 96570
negative_passages.text: Solar Cell - Preventing overcharge of an NiMH battery
negative_passages.docid: 80449
negative_passages.text: DIY 24v to 5v usb phone charger
negative_passages.docid: 14740
negative_passages.text: How to Measure Power Consumption on Extremely Low Power Devices?