Equus Innova 3721 Battery and Charging System Monitor

45 reviews ratings
By: Innova
Walmart #: 551722731
Equus Innova 3721 Battery and Charging System Monitor
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  • For use with 12V outlet
  • LCD display
  • Head pivots for easy viewing
  • About this item

    The Equus Innova 3721 Battery charging system monitor keeps track of your car's battery to help you avoid car break downs due to a low battery. This 12-volt battery monitor is easy to use. It plugs into your cigarette lighter outlet to help you to monitor the battery and the charging system voltage. This car battery monitor features an LCD display that shows the voltage in a bar graph. It has color-coded LEDs that indicate the battery's status. A pivoting head allows you to view the battery charging system monitor from any direction.

    Equus Innova 3721 Battery and Charging System Monitor:

  • Designed for use with 12V outlet
  • Monitors battery and charging system voltage
  • LCD displays measured voltage with bar graph
  • Color-coded LEDs identify battery's charge status
  • Head pivots for easy viewing
  • Specifications

    Battery Type: Does Not Contain a Battery
    Model No.: 3721
    Shipping Weight (in pounds): 0.3
    Product in Inches (L x W x H): 4.25 x 1.5 x 10.25
    Assembled in Country of Origin: Imported
    Origin of Components: Imported
    Walmart No.: 551722731

    Customer reviews

    Customer Reviews | 45 reviews | 4.5 out of 5

    4.5 stars

    45 reviews | 4.5 out of 5

    5 stars
    4 stars
    3 stars
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    Would recommend to a friend




    Customer review by rtlrp12

    5.0 stars by rtlrp12

    I purchased this to monitor my 12v portable power packs I use for camping. I'm a retired Master auto technician and I used a $3000 digital lab scope to test the accuracy of the monitor. I was very surprised at the accuracy. It was right in line with the expensive unit.

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    So. Cal
    Would recommend to a friend? Yes
    Age:55 - 64
    Ownership:2 - 3 months
    Usage:Every few days
    A TRUE voltage monitor

    Customer review by MarineChief

    5.0 stars by MarineChief

    I bought this SPECIFICALLY because it indicated "hundredths" of volt. In this way you can really see the condition of your 12v battery & charge system. I feel that using only the single decimal does not give sufficient charge indication as 12.7v is indicative of full (100%) charge and 12.2v is already under 50% - the extra decimal digit just gives better info. Value has four stars only because I did find this in the local store (afterward) at a lower price even though searching online claimed the local to have none when I made my initial check. I suggest actually checking the physical store prior to ordering online if at all possible - you may save a few bucks and get it quicker.

    Was this review helpful? (12) (1)
    Thank you! You have successfully submitted feedback for this review.
    Would recommend to a friend? Yes
    Age:55 - 64
    Ownership:2 - 7 weeks
    Usage:Every day
    Easy & accurate

    Customer review by santeejj

    5.0 stars by santeejj

    Easy product to use and provides very accurate readings. Served my purposes completely

    Was this review helpful? (10) (0)
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    Pharr, TX
    Would recommend to a friend? Yes
    Age:65 or older
    Ownership:2 - 7 weeks
    Usage:Every day
    1-3 of 41 total reviews See all

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    by rbryant108 11/22/2010
    9 answers
    • A. Well sort of. If you become familiar with the normal voltage drop with engine off. you can notice a draw when you step on brake or leave headlights on. There are better methods and tools to find a parasitic power draw. In a pinch it could be done.
      by poolguru1/3/2015
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    • A. All this battery monitor does is measure and display the voltage. It does it three ways: with a digital readout, "idiot" lights, and a voltage indicator. All batteries lose voltage over time, but a significant loss of voltage could be indicated by regular monitoring of the system voltage.
      by b6fischer3/6/2014
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    • A. I agree with those who answered "yes, but not directly". And probably not right away. Depending on the current draw of whatever is draining your battery, it could take from a few minutes to a few days for it to show up. But, if there is a drain of any significance, it will show up in the form of reduced battery voltage over time. Note: that test must be done when the engine is not running. If you start the engine, even briefly, the alternator will at least partially recharge the battery and you will not get an accurate reading. I used a similar battery/charging system tester to help determine that my mother in law had a slow drain on her battery that was causing the voltage to drop significantly when the car sat for 2 or 3 days. The problem turned out to be the glove compartment light that was not turning off.
      by Richard029/15/2013
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    • A. No. This is a volt meter, and will only read the voltage present from the battery and/or the charging system. To detect excessive power drain, you will need to use an ampere meter to read current draw.
      by PJSprog8/14/2012
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    • A. Sorry for the delay in giving an answer to you and hope you have (by now) found your problem. BUT, if not... to locate battery drain it is better to use an inline amp meter to check for what are called "phantom loads". These can be as simple as the radio memory or clock circuits and as complex as a stuck relay or a wire that has pinched and is bleeding to ground (hopefully not the latter as they are usually difficult to find). Anyway once you have a reading on you amp meter you can then selectively disconnect items to see if the draw diminishes or disappears - do this by fuse pulling or physical wire disconnection (hopefully through plug connector or spade terminals). GOOD LUCK !!
      by MarineChief9/15/2013
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    • A. Yes It Show Low Voltage Before You Start Car.
      by ModSquadApproved8/4/2012
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    • A. Yes, by monitoring the voltage over time you would see a voltage drop. This monitors voltage to .00 volts so a drain will so up almost immediately. You will need to wait for 10 to 20 minutes with the battery at rest before testing.
      by rtlrp1211/25/2012
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    • A. I believe it would because it will display a decrease in the available voltage.
      by santeejj12/13/2010
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    • A. Not directly. But if you have a power drain, your battery voltage will fall over time when the engine is not running. This device will let you observe the voltage and determine if it is falling. Basically, if your car can sit overnight or for a couple of days and the device is still indicating a full battery, you probably do not have a significant drain.
      by Barry39/15/2013
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    I bought a new Interstate Battery and then had this device plugged in. It gave me a full voltage reading of 14 volts but the charge indicator was just half way through. Even after driving the car for 2 days the charge level is still just halfway. What would that mean? Is anything wrong with the battery?
    by PDharek 5/8/2011
    5 answers
    • A. Also check your alternator and voltage regulator
      by cloudcroft9/5/2014
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    • A. With the engine on you are reading the alternator voltage. If you want to test battery voltage turn the engine off. The half way point means not too high and not too low.
      by poolguru7/10/2014
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    • A. If your reading was 14 Volts, then the battery monitor should have had displayed a small circle with arrow icon showing above the voltage reading. This indicates it is in Charge mode and the indicator on the right side of the screen has nothing to do with the battery. If you were to turn the car engine off and then turn the ignition to the on position (but not starting the car), then you would see a little battery icon showing above the voltage read-out, and your voltage would likely show 12.6 or so volts. Now the indicator on the right would help you "see" the state of your battery's charge.
      by b6fischer6/1/2015
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    • A. I think it could be the alternator, just check it, u don't have anything to loose.
      by memua6/28/2012
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    • A. With the engine running, the charge indicator indicates alternator output voltage, not battery voltage. That is why you are reading 14 volts or more. The graph in the middle of the range means not too low, not too high. With the engine off, battery voltage is being read and a reading of 12.6 volts should show a full or nearly full battery on the graph, which is good. (See the package illustration.)
      by Doneright1/17/2014
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    with two arrows. The instructions don't explain this. Thanks a million in advance.
    by MickyMouce 8/20/2011
    4 answers
    • A. The battery means voltage with engine off, so you can tell if the battery is charged up. The circle denotes voltage with engine on, so you can gauge alternator health.
      by poolguru4/17/2015
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    • A. The meter has two modes for the colored lights at the bottom: one for battery voltage and one for charging voltage. The circle with arrows shows when the meter is in "Charging" mode. The image of the batteries shows when the meter is in Battery mode. Green light shines in Charge mode between 13.3 & 14.4 volts. Green light shines in Battery mode at 12.6 volts and over.
      by b6fischer3/29/2015
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    • A. This has two modes. One mode is active when the engine is running and it is testing your alternator output. That is indicated by the symbol with two arrows. The other mode is active when your engine is stopped and it is testing the voltage of your battery. That is indicated by the battery symbol. It switches automatically between modes. Note that some cars have an alternator that drops its output at times to save gasoline. This device will give you a red warning light at those times and you might think your alternator is failing. Turn on your ventilation fan and you will see the alternator output return to normal.
      by Barry34/17/2015
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    • A. I believe that the battery symbol indicates that battery voltage is being read with the engine off, and the circle with arrows indicates that the engine is running and the alternator voltage is being read.
      by Doneright4/17/2015
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    1-3 of 6 questions See all

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    Product warranty: 1 Year See details

    Supplier Warranty: The Manufacturer warrants to the original purchaser that this unit is freeof defects in materials and workmanship under normal use and maintenance for a period of one (1) year from the date of original purchase.If the unit fails within the one (1) year period, it will be repaired or replaced, at the Manufacturer s option, at no charge, when returned prepaid to the Service Center with Proof of Purchase. The sales receipt may be used for this purpose. Installation labor is not covered under this warranty. All replacement parts, whether new or remanufactured,assume as their warranty period only the remaining time of this warranty.This warranty does not apply to damage caused by improper use, accident, abuse, improper voltage, service, fire, flood, lightning, or other acts of God, or if the product was altered or repaired by anyone other than the Manufacturer s Service Center. The Manufacturer, under no circumstances shall be liable for any consequential damages for breach of any written warranty of this unit. This warranty gives you specific legal rights, and you may also have rights, which vary from state to state. This manual is copyrighted with all rights reserved. No portion of this document may be copied or reproduced by any means without the express written permission of the Manufacturer. THIS WARRANTY IS NOT TRANSFERABLE. For service, send via U.P.S. (if possible) prepaid to Manufacturer. Allow 3-4 weeks for service/repair.
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