Battery Basics

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Battery Basics

  1. 1. Battery Basics Rob Faludi
  2. 2. there are thousands of different batteries
  3. 3. only one is best for your project
  4. 4. factors to consider • Power needs • Maximum current • Run time • Replacement schedule • Size • Shelf-life • Context and availability
  5. 5. one factor at a time
  6. 6. pressure and current • Voltage ~= water pressure • Amperes ~= water current
  7. 7. power • WATTS • Wattage: W = VA • watts = volts * amps • 100 volts, 2A = ? • 3.3 volts, 100 mA = ?
  8. 8. capacity • mAh = milliamp hour • how many milliamps supplied for 1 hour • capacity is total power available over time • run time is based on capacity
  9. 9. calculating run time • power draw over time • mAh = mA * hours • measuring amperage
  10. 10. PRODUCT DATASHEET 1-800-383-7323 / USA USA/CAN 1-800-383-7323 www.energizer.com 1-800-383-7323 / CANADA ENERGIZER 522 9V data sheets Specifications Classification: Alkaline Chemical System: Zinc-Manganese Dioxide (Zn/MnO 2) No added mercury or cadmium Designation: ANSI-1604A, IEC-6LR61 Nominal Voltage: 9.0 volts Operating Temp: -18°C to 55°C (0°F to 130°F) Industry Standard Dimensions Typical Weight: 45.6 grams (1.6 oz.) mm (inches) Typical Volume: 21.1 cubic centimeters (1.3 cubic inch) Jacket: Metal Shelf Life: 5 years at 21°C (80% of initial capacity) 17.50 (0.689) Terminal: Miniature Snap 15.50 (0.610) 12.95 (0.510) 12.45 (0.490) 26.50 (1.043) 24.50 (0.965) Milliamp-Hours Capacity • Continuous discharge to 4.8 volts at 21°C Look for: 800 Capacity (mAh) 600 48.50 (1.909) 46.40 (1.827) 46.50 (1.831) 400 Maximum • mAh 200 0 25 100 300 500 Discharge (mA) • max current Device Selection Guide: Battery Selection Indicator High Drain Toy Devices • Voltage Baby Monitor Garage Opener Moderate Drain Devices Clock Radio Smoke Detector Low Drain Devices Important Notice This datasheet contains typical information specific to products manufactured at the time of its publication. ©Energizer Holdings, Inc. - Contents herein do not constitute a warranty. Form No. EBC - 1108I Page 1 of 2
  11. 11. batteries come in more than one flavor
  12. 12. chemistry • Alkaline • NiMH • NiCad • Lithium • Lithium Ion
  13. 13. size, life and access • D, C, AA, AAA • Coin cells • Li-ion packs • Self draining • Availability
  14. 14. other stuff • Step-ups • Solar • Capacitors
  15. 15. sourcing • http://itp.nyu.edu/ physcomp/Parts/ RechargeableBatteries • http:// www.sparkfun.com/ commerce/ categories.php?c=54
  16. 16. chargers
  17. 17. battery tests • http://www.faludi.com/projects/arduino- and-xbee-battery-test-results/
  18. 18. scenarios 1. Power needs 2. Max current 3. Run time 4. Capacity 5. Size 6. Shelf-life 7. Context and availability
  19. 19. Rob Faludi www.faludi.com

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