Amp Hour
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How would you test the Amp Hour rating of a battery?
I have a battery that is supposed to last 40AH, but I don’t think its really a 40AH battery because its not lasting as long as it should. Is there a way that I can test the Amp Hour rating of the battery? What kind of equipment would this require?
I wouldn’t mind spending a little money on test equipment, because I need a battery that is as small and as lite as possible that puts out 40AH. If I have to spend some money and test a bunch of batteries it would be worth it to me.
We test batteries everyday at work. For a lead-acid battery, the amp-hour capacity of a battery is defined as the constant current that will discharge the battery in 20 hours at 20°C. Generally, fully charged is defined as something like 2.2 V per cell and fully discharged is defined as 1.75 V per cell (depends on the manufacturer).
If you discharge the battery faster than 20 hours, your amp-hour rating will be less than the 20 hour value. If you discharge the battery slower it will be greater than the 20 hour value. Batteries do perform worse with respect to capacity at low temperature. They also have less capacity with time. Note that many batteries (like car batteries) are not designed to be fully discharged repeatedly and this will reduce their lifetime.
As far as equipment, there are a number of ways to measure capacity. We have current sources at work that draw a fixed amperage. We simply monitor the voltage and current while the battery is being discharged. You can then multiply current times time to amp-hours. If you don’t have a current source (they are a specialty piece of equipment), I would use a resistor load (battery voltage doesn’t vary that much) and a voltage monitor. Knowing battery voltage versus time and resistance, you can determine the current draw versus time. You can then integrate the current over time to get amp-hours.
Here are some excellent bargains on ebay for Amp Hour
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Black & Decker VP110 VersaPak Gold 3.6-Volt 2 Amp Hour NiMH Gold Battery- NIB!!! $17.99 |
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DEWALT DC9091 XRP 14.4-Volt 2.4 Amp Hour NiCad Pod Style Battery NEW $49.95 |
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Makita MAK192600-1 2.0-Amp Hour NiCad Pod Style Battery $0.99 |
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DEWALT DC9091 XRP 14.4-Volt 2.4 Amp Hour NiCad Pod Style Battery NEW $59.95 |
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MKT-193158-3 Makita 14.4-Volt 2.6 Amp Hour NIMH Pod Style Battery $101.55 |
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MKT-194172-2 Makita 14.4-Volt 1.3 Amp Hour NiCad Pod Style Battery $74.56 |
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DEWALT DC9091 XRP 14.4-Volt 2.4 Amp Hour NiCad Pod Style Battery 2 Pack NEW $114.95 |
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Panasonic EY9251B 18-Volt 3.5 Amp Hour NiMH Pod Battery $102.00 |
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MAKITA BH2420 24-Volt 2.0 Amp Hour NiMH Slide Rechargeable Battery 193737-7 $164.50 |
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Black & Decker VP110 VersaPak Gold 3.6-Volt 2 Amp Hour NiMH Gold Batteries NIB!! $5.15 |
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MKT-193158-3 Makita 14.4-Volt 2.6 Amp Hour NIMH Pod Style Battery $101.55 |
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MKT-193979-3 Makita 9.6-Volt 1.3 Amp Hour NiCad Pod Style Battery $57.60 |
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MKT-193983-2 Makita 12-Volt 1.3 Amp Hour NiCad Pod Style Battery $67.80 |
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MKT-194172-2 Makita 14.4-Volt 1.3 Amp Hour NiCad Pod Style Battery $74.56 |
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MKT-BL1815 Makita 18-Volt 1.5 Amp Hour Battery for LCT $97.50 |
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DEWALT DC9091 XRP 14.4-Volt 2.4 Amp Hour NiCad Pod Style Battery 2 Pack NEW $114.95 |
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Black & Decker VP110 VersaPak Gold 3.6-Volt 2 Amp Hour NiMH Gold Battery- NIB!!! $7.40 |
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DEWALT DC9091 XRP 14.4-Volt 2.4 Amp Hour NiCad Pod Style Battery NEW $49.95 |
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Bosch BAT100 9.6V 2.0 Amp Hour Bluecore Battery 2.0ah $1.00 |
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Milwaukee 48-11-1830 3.0 Amp 18-Volt Hour Lithium-Ion Battery $88.37 |
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(2) RIDGID 18V R84008 LI-ION 3.0 amp hour 130383019 TWO BATTERY PACKS NEW NIP $139.00 |
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Panasonic EY9021B 2.4 Volt 2.0 Amp Hour NiCad Stick St $17.59 |
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Makita 1834 18-Volt 2.6 Amp Hour NiMH Pod-Style Battery $99.95 |
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Milwaukee 48-11-1024 14.4-Volt 2.4 Amp Hour NiCad Slide Style Battery $78.99 |
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5 Pack New Milwaukee 48-11-2830 M28 28 Volt Lithium-Ion Batteries 3.0 Amp Hour $499.99 |
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Bosch BAT100 9.6V 2.0 Amp Hour Bluecore Battery 2.0ah $37.50 |
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Skil 144BAT 14-2/5-Volt 1-1/5-Amp Hour NiCad Pod Style Battery $54.36 |
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Skil 92940 FlexCharge 3.6-Volt 1.0-Amp Hour NiCad Battery $19.68 |
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Black and Decker VP110 VersaPak Gold 3.6-Volt 2 Amp Hour NiMH Gold Battery $23.29 |
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Bosch BAT181 BlueCore 18-Volt 2.4 Amp Hour NiCad Battery $100.74 |
And a few more great deals on Amazon:
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Westinghouse T00448 2-Outlet Indoor Mechanical Timer, White $5.00 … |
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Lasko 1820 Performance 18-Inch Adjustable Oscillating Pedestal Fan $25.99 Natural Breeze Select Varied Gentle Wind Modes Whisper Quiet Operation 90 Degree Oscillating Or Directional Height Adjusts To 38″” Or 54-1/2″” High Volume Air Movement Energy Efficient Sturdy Round Base Requires Minimal Floor Space UL Listed… |
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Lasko 2526 16′ Adjustable Pedestal Fan $24.72 Lasko 2526 16″ Pedestal FanLasko 2526 16″ Pedestal Fan Features;; Pedestal fan is whisper quiet, ideal for homes and offices; Plastic front and rear grills snap together; 3 energy efficient speeds with whisper-quiet power; Full 90?? oscillation or stationary cooling; Full tilt-back head to direct air where needed; Full adjustable heights, 37″ to 53″, for maximum versatility; 120 volts; 50 watts; 6… |
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Golden Hour K.J.Yesudas – Evergreen Melodies $15.99 Golden Hour K.J.Yesudas – Evergreen Melodies by K.J. YesudasThis product is manufactured on demand using CD-R recordable media. Amazon.com’s standard return policy will apply…. |
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The Final Hour $15.99 The Final Hour by 9 VoltThis product is manufactured on demand using CD-R recordable media. Amazon.com’s standard return policy will apply…. |
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Happy Hour 2.4.1 $15.99 Happy Hour 2.4.1 by Herb Silverstein MDThis product is manufactured on demand using CD-R recordable media. Amazon.com’s standard return policy will apply…. |
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Black & Decker HPB18-OPE 18-Volt Slide Pack Battery For 18-Volt Outdoor Cordless Power Tools $32.98 18V slide battery pack for use with all Black & Decker 18V outdoor power tools; for interchangeable convenience and value…. |
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P3 International P4400 Kill A Watt Electricity Usage Monitor $50.00 Empowers You to Save Hundreds on Electric Bills Electricity bills are rising. Now you can cut down on costs and find out what appliances are actually worth keeping plugged in. Simply connect these appliances to the Kill A Watt, and it will assess how efficient they really are. The large LCD display counts consumption by the kilowatt-hour, the same as your local utility. You can calculate your elec… |
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DEWALT DC9096-2 18-Volt XRP 2.4 Amp Hour NiCad Pod-Style Battery, 2 Pack $232.44 Keep your DEWALT 18-volt cordless tools powered with the DC9096 XRP extended run time batteries. DEWALT uses top-quality NiCd cells, offering a consistent and adaptable performance. The extended run time batteries deliver 40 percent more run time with new cobalt technology…. |
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Agatha Christie’s Poirot – The Classic Collection, Vol. 2 $70.61 Nine feature-length mysteries from the series–including “The ABC Murders,” “Dumb Witness,” “Hercule Poirot’s Christmas,” “Hickory Dickory Dock,” and “Peril at End House”–plus the documentary “Agatha Christie’s Garden” are featured in a 10-disc set. 16 1/2 hrs. total. Standard; Soundtrack: English Dolby Digital stereo; biographies; filmographies…. |
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