E-Bike, Electric Bike Battery Monitor & Amp Hour Meter

More Than Just An Amp Hour Meter Or Watt Meter

Watt's Up watt meter

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The "Watt's Up" as an e-bike and electric bike battery monitor meter tells you everything you need to know about electric bike and electric vehicle operation and can be among the most valued of your electric vehicle tools. Motorized wheelchair, motorized bicycle and golf cart owners will love it too.

Use the Amp hour (Ah) and Watt hour (Wh) measurements as a "fuel gage" for range so you don't get stranded. They're much more accurate for this than voltage measurements or LED "Battery Indicators". Voltage measurements to determine battery capacity are inconclusive because of temperature, battery age, variation in discharge rate, and other parameters. Amp hour and Watt hour measurements directly measure the energy put in or removed from a battery.

The "Watt's Up" Watt meter used as a battery monitor measures:

  • Amp-Hours
  • Watt-hours
  • Amps
  • Peak Amps, peak Watts, and minimum Voltage ("sags")
  • Watts
  • Voltage

Measure charge consumption (Ah & Wh), motor Amps, battery voltage and efficiency, power usage and troubleshoot hard to find electrical problems with the peak Amps & Watts and minimum voltage measurements. The peak and minimum measurements also help you verify safe operation of motors, controllers and batteries.

"Watt's Up" works with your 12, 24, 36 or 48 volt battery up to 60 V. Lead acid, SLA, NimH, NiCD and Lithium ion and Li-Poly or Lithium polymer batteries are all compatible. Helps you evaluate the effect of component changes and tuning.

See how to use our Watt meters.


Easy To Use

Connect it like jumper cables between battery and motor controller. Plus to plus, minus to minus. Or use a "3-wire" connection (e.g. for handlebar mounting) so only two wires need to carry high current. "Watt's Up" is supplied without connectors so you can connect it however you like.

Better than a multimeter because of higher current limit, real time calculation of power, Amp hour and Watt hour measurements, capture of peak Amps, peak Watts and voltage minimums and does so with much lower shunt resistance.

Summary of Features

  • Made in USA to ISO 9001 quality standards
  • Small size and lightweight - 2.8" L x 1.7" W x 0.83" D, 2.3 oz.
  • Low, 0.001 Ohm insertion resistance
  • Full manual with electrical tutorial
  • One Year Warranty


See more detailed Amp meter specifications.

Example Connections

See Bike Meter connection diagrams.

Power Options

"Watt's Up" draws very little current (~ 0.007 Amps) from your main battery. Or you can choose to power it (using our auxiliary power connector cable) with an external battery or power source. The auxiliary power source can have a wide voltage range. Statistics are maintained until all power sources are removed.



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DC Amp Meter Applications

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meter simulator and see how "Watt's Up" works.

Just wanted to let you know I LOVE this meter! I'm playing around building CD ROM motors and the meter makes it so easy to objectively evaluate the performance of each motor. I am also very pleased with the size, construction and ease of use.

Thanks for a great product! - T.S.

Electric Bike Meter