Name: Innova 3721 Battery and Charging System Monitor
Brand: INNOVA ELECTRONICS
SKU: 15137663
Price: 21.72 USD
Availability: InStock
Rating: 4.5 (88 reviews)

You get 30 days free! Choose a plan at checkout.

#46474A

I want shipping & delivery savings with

#0071DC

New Item Page - Fulfillment Module Module, Monday, March 13, 2023, 9:14:42:77 pm

BuyBoxAds-dweb

dWeb:New Item Page - Item Digital Rewards Module, Monday, March 13, 2023, 9:14:11:88 pm

AddToCart EA FY25 - preEA

New Breadcrumb Module, Wednesday, November 30, 2022, 8:57:51:81 pm

Sellers Secondary BuyBox

NEW BrandBoxDisplayAd Mon Jan 22 2024 11:50 AM PST

Learn more

See if you’re pre-approved with no credit risk.

dWeb Capital One Banner Web Module - Desktop - 4.29.21

Price Match Policy

Prices, terms, and availability may vary online, in stores, and in-app. Items ordered online may be available for pick up at store, shipping, or delivery. Some items may be available from Marketplace Sellers, who set their own prices, and are not eligible for price match. Items sold online by Walmart may be eligible for price match. See our

dWeb Legal Price Disclaimer Module, Friday, February 03, 2023, 10:32:52:27 am

Make these frames your own

WomanWithGlassesBlueCircle-2

New! Make these frames your own and get prescription sun lenses.

New! Customize these frames with prescription lenses that match your vision needs.

Non-prescription sunglasses

Prescription sunglasses

How do you want your frames?

Dweb LensCustomizationBuyBox Tue Oct 17 2023 8:37 AM PDT

dWeb MP Extra Savings (PromoDiscount) Tue Feb 20 2024 2:49 PM PST

New!

More savings, less stress.

Subscribe to get what you need, when you need it.  Cancel anytime.

k2-_a94389a3-a383-4f60-ac15-2c8aaf17c372.v1

How it works

dWeb - New Item Page - Subscription Options Module Module, Wednesday, March 15, 2023, 1:58:05:80 pm

dWeb New Related Search Module, Tuesday, March 28, 2023, 9:39:42:58 am

dWeb Payment Plans Module, Thursday, February 02, 2023, 10:34:25:26 am

dWeb Price Information Module, Tuesday, February 07, 2023, 8:58:43:19 am

dWeb ProductFlags Module, Tuesday, January 31, 2023, 2:53:18:55 pm

dWeb SecondaryOfferBoostModule AB Fri Sep 15 2023 10:50 AM PDT

General Warnings Placeholder

HRF_dWeb_PrevPurchased ReviewPurchaseBadges Wed Feb 21 2024 11:16 AM PST

Why Walmart Pre-Owned?

for additional details & specific condition qualifications.

Walmart Pre-Owned allows you to find previously owned, well-cared-for items from Walmart’s trusted & performance-managed sellers. Shopping Pre-Owned allows you to bring home the best-quality picks at even lower prices, in addition to extending the life of an item & reducing waste. Find your favorites & shop a range of conditions in every category.

Each Pre-Owned item listed comes from Walmart’s trusted performance-managed sellers, to ensure you get quality items.

Save even more on top brands & your most-loved items.

Don’t love it? Most items offer a 30-day* free return policy, for added peace of mind.

Shopping Pre-Owned helps in extending the life of an item & reducing waste.

 here

Item PreOwned Info Content Module Wed Dec 13 2023 9:27 PM PST

Marquee Display Ad IP BTF Global

Multiple SocialProofBadges Wed Feb 21 2024 11:03 AM PST

NEW AddonServicesRedesign dWeb Wed Sep 13 2023 1:25 AM PDT

NEW AddToCart Wed Sep 20 2023 4:30 AM PDT

New AlertContainer Module, Monday, February 27, 2023, 8:05:31:02 pm

New BuyBoxRefurbishedMessage Module, Thursday, February 02, 2023, 10:35:03:28 am

NEW BuyBoxRefurbishedMessage Wed Sep 27 2023 2:57 AM PDT

New dWeb Buy Box Ratings and Reviews Module, Friday, February 03, 2023, 10:39:02:52 am

Save up to 35% on additional pairs

Terms & conditions

Purchase multiple pairs of eyeglasses (frame & prescription lenses) to get 20% off each additional pair of glasses after your first order. Multiple qualifying glasses must be purchased during a single online transaction. Qualifying purchases include: a complete pair of prescription eyeglasses (frame & prescription lenses) or an insurance order for a complete pair of glasses. Insurance benefits should be maximized on the first order (if applicable).

Discounts must be applied to qualifying orders that are of equal or lesser value. For 35% off, purchase a complete pair of sunglasses in addition to a second complete pair. Qualifying purchases include any prescription polarized or non-polarized sun lens & frame purchase. The least expensive pair(s) will receive the 35% discount.

NEW dWeb VisionPromoDiscount Tue Oct 17 2023 8:48 AM PDT

WMHealthServicesPetPharmacy

We'll verify prescriptions with your vet.

This item requires prescription 

Learn More

NEW EducationalBanner Wed Jan 03 2024 1:28 PM PST

New FSA HSA Badges Module, Monday, March 13, 2023, 9:17:58:10 pm

#515357

#0071dc

NEW Fulfillment Wed Sep 20 2023 4:55 AM PDT

NEW GiftingEligibilityBadge Wed Sep 20 2023 4:42 AM PDT

NEW GiftingNote Wed Sep 20 2023 4:43 AM PDT

New Insurance Badging Module, Monday, March 13, 2023, 9:17:27:54 pm

NEW ItemBackInStockNotifyMe Tue Jan 09 2024 10:44 AM PST

New Item Page - BTF Marketing Content Placeholder Module, Monday, August 15, 2022, 8:53:04:04 pm

New Item Page - Buy Box BrandLink Module, Tuesday, January 31, 2023, 2:53:51:15 pm

UX-Illustration-Export

Manage Prescriptions

Congrats! You're one of the first pet parents to try PetRx Beta. You can easily

New Item Page - Educational Banner Module Module, Monday, July 10, 2023, 10:53:41:13 am

New Item Page - Gifting Eligibility Badge Module, Monday, March 13, 2023, 9:16:24:97 pm

New Item Page - Gifting Note Module, Monday, March 13, 2023, 9:16:53:59 pm

New Item Page - Hard Bundles Module Module, Wednesday, May 03, 2023, 8:05:20:16 pm

New Item Page - Physical Gift Card Options Module, Monday, March 13, 2023, 9:13:38:03 pm

New Item Page - Product Feedback Placeholder Module, Thursday, July 01, 2021, 10:06:34:87 am

New Item Page - Product Highlights Placeholder Module, Friday, July 07, 2023, 4:23:12:78 pm

New Item Page - Product Images Module, Monday, March 13, 2023, 9:11:14:73 pm

New Item Page - Product Ingredients Placeholder Module, Monday, September 20, 2021, 11:16:28:55 am

New Item Page - Product Return Policy Module, Monday, March 13, 2023, 9:15:45:32 pm

New Item Page Product Sticky Buy Box Module, Wednesday, March 22, 2023, 10:37:31:45 am

New Item Page - Product Variants Module, Monday, March 13, 2023, 9:12:12:78 pm

New Item Page - Refurbished Info Placeholder Module, Thursday, July 07, 2022, 7:16:32:83 pm

Sell on Walmart

New Itempage Sell On Walmart Module

New Item Page - Sold And Shipped By Module, Monday, March 13, 2023, 9:15:15:89 pm

New Item Related Shelves Module, Wednesday, July 21, 2021, 10:06:24:65 am

NEW LegalPriceDisclaimer Wed Sep 20 2023 4:24 AM PDT

New Lists And Registries Module, Monday, March 13, 2023, 9:20:39:60 pm

NEW MarqueeDisplayAd Mon Jan 22 2024 11:47 AM PST

New Non Config Bundles Module, Monday, March 13, 2023, 9:22:47:13 pm

One card 2.svg

getStarted

New One Debit Card Banner Module, Friday, March 24, 2023, 2:51:24:44 pm

NEW PaymentPlans Wed Sep 20 2023 4:21 AM PDT

NEW PhysicalGiftCardOptions Wed Sep 20 2023 4:40 AM PDT

NEW PriceInformation Wed Sep 20 2023 4:12 AM PDT

New Product Basic Info Module, Thursday, February 02, 2023, 10:33:55:14 am

NEW ProductBasicInfo Wed Sep 20 2023 4:19 AM PDT

New Product Medical Guides Placeholder Module, Friday, January 27, 2023, 10:34:52:34 am

New Product Name Module, Tuesday, January 31, 2023, 3:22:20:63 pm

NEW ProductReturnPolicy Wed Sep 20 2023 4:42 AM PDT

New Service Disclosure Module, Wednesday, March 15, 2023, 1:53:08:90 pm

NEW SoldAndShippedBy Wed Sep 20 2023 4:41 AM PDT

NEW Variants Wed Sep 20 2023 4:31 AM PDT

Nutrition Value Placeholder

Product Description Placeholder

Product Directions Placeholder

Product Indications Placeholder

Product Specifications Placeholder

Product Warranty Placeholder

Reviews Placeholder

Skyline - rweb

More items to explore

SPCarousel2-rweb

Products you may also like

Complete The Look Module Placeholder

See Similar Items

Item Carousel - Recommendations 1

Item Carousel - Recommendations 2

Recommendations for you

Item Carousel - Recommendations 3

Item Carousel - Recommendations 4

Frequently Bought Together

New SoftBundles Module, Wednesday, May 03, 2023, 10:17:01:79 am

True

New Comparison Chart Module, Thursday, May 04, 2023, 3:43:45:98 pm

Innova 3721 Battery and Charging System Monitor

<p><strong>Equus Innova 3721 Battery and Charging System Monitor:</strong></p>  <ul>   <li>Designed for use with 12V outlet</li>   <li>Monitors battery and charging system voltage</li>   <li>LCD displays measured voltage with bar graph</li>   <li>Color-coded LEDs identify battery's charge status</li>   <li>Head pivots for easy viewing</li>  </ul>

Innova Electronics 3721 Battery/Charging System T

Brand

Manufacturer

manufacturer_part_number

Warning Text

Reviewers highlighted: reading, ease of use

title_shipToHome_date_free_delivery

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.

I believe it would because it will display a decrease in the available voltage.

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.

Yes It Show Low Voltage Before You Start Car.

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 !!

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.

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.

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.

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.

Would this tell me I have a power drain from something like a bad relay?

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.)

I think it could be the alternator, just check it, u don't have anything to loose.

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.

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.

Also check your alternator and voltage regulator

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.

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.

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.

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.

Can any body tell me what do the symbols on the screen of the indicator mean? There is one of a battery that is coming on and off and one of a circle

Battery

Charging

Price

Display

Reading

Ease Of Use

Voltage

Light

Volt Meter

Alternator

Value

I use this voltmeter to provide an inexpensive way to get a reading of my camper battery's voltage, so as not to under or overcharge it. I installed a weatherproof power socket right on the battery box, located on the trailer tongue, and hooked it up to the battery terminals with an in-line 10 amp fuse on the positive lead. Then, because the voltmeter is a plug-in type, I can easily pull it out after getting a quick reading, and protect it from the weather. Afterward I can plug it into a power socket inside my tow vehicle, so as to monitor the tow vehicle's battery as well. The meter has digital and lighted displays that are easy to read. Although just installed, it looks like a winner.

Plug-in voltmeter was "a perfect fit".

This product makes it very easy to evaluate alternator and battery issues instantly. Large digital readout. This is my second one. My first one lasted for many years. This is an excellent diagnostic tool and the price is hard to beat.

Great product and value

Bought for its two decimal readout and adjustable head. When I checked its accuracy against a $150 Fluke DIgital Multimeter, the Equus voltage was within 0.02 volts. Wow!

Exceeded my expectations, and at $13 it is a great value. Every RV or Boat should have one as a primary or secondary battery monitor.

Super Value and Accurate

My volt meter in my 03 Silverado 1500 HD quit working about two years ago, I checked battery and alternator voltage peoridocally with my multimeter, but it was unerving to be miles from home and not have constant monitoring as I pull a 25' fith wheel camper, now in excess of 90,ooo miles across the US and Canada. (yes ninty housand) tip-use 3rd gear not drive.
I was doing a intrnet search lookind for a better way than replacing the instrument cluster, when I saw this device which plugs in the lighter receptical, reading the instructions, specifications and reviews, this shoud work great. and it does, very happy with this product. ordered on line from Wallmart, it arrived at my local store in bout one week.

This "Innova" battery monitor is a quick way to check your "battery voltage" and "alternator voltage" all in one package. Before starting your car (when the car is not running), this monitor easily plugs in to your cigarette lighter, and you get an instance display of your car battery voltage. As you see in my picture, it show's  12.70  and a "green" light, indicating "full voltage".  "Yellow" light would indicate "low voltage" between 12.1 to 12.4 volt's in your battery, and "Red" would indicate, get help quick before you drain your battery and "time to locate the problem". Then while the engine is running/driving you will see the "voltage display" spike in voltage (13.3/14.4)green light, indicating " your alternator is working ", anything below 13.1 yellow light and a big red light 12.6 you might need to check your alternator or just use the helpful quick tip's included in package, to locate your problem. Great battery monitor to have onhand and can be used/switch from car to car to check your charging situation, in any vehicle. with a cigarette lighter. This would make a great gift, for the car gadget's person.

instant display.......

Handy battery and alternator check that can lead you to further checks and actions.

Handy battery and alternator check

Bought the 3721 battery monitor and love the ability of knowing how the battery and alternator are performing while driving the vehicle. I bought a couple of these and gave them out as birthday gifts to both of my sons. They love them too!

Love the battery movement monitor

Innova

while you're waiting for innova tool to arrive, do these steps first: check your alternator drive belt for tension and condition. next, clean your battery posts shiny clean. check your negative battery cable has a good ground to motor or frame and it's clean and not all rusty or whatever. check your battery cells filling to proper level with distilled water if your battery is not gel sealed or similar. now you're set to plug in the tool. check voltage before starting with key on. to get an idea of what this tool can do for you, turn on a heater fan or something similar like parking lights. you will see voltage immediately drop. now, start the car/truck/mh or what have you. the voltage drops when starter cranks. so, now your motor is running. notice voltage rise to almost 14 volts or similar. this tells you alternator should be working fine. next time you drive your car, plug in tool. check voltage while driving if you wish.  my neighbor borrowed mine and found his alternator was not working as expected. he promptly replaced his drive belt and cleaned all.  i live in the northwest. our weather is worst for batteries. battery maintenance in northwest is almost a religion.  anyway, buy this tool. it can save you an ugly headache of no start in grocery store parking lot. by the way, walmart installs new batteries and does so in a professional manner (we know and use walmart batteries) at no charge for install.

First things First

My Hyundai Genesis was giving intermittent "Battery Discharge Warning" error messages. The car does not have a volt meter & the dealer said everything tested fine. So I purchased the Equus Innova 3721 volt meter & plugged it into one of my power ports. It didn't take long for this little device to pinpoint that the Genesis charging system does not charge based on electrical load but rather on operating settings.  So far the only times I have observed it charging are when the headlights are on or if the headlights are off, when the car is coasting with a closed throttle at speeds greater than 5 mph. So now I burn the headlights on all the time, the system charges all the time, & I have not seen any more error messages. The volt meter was well worth the $10 it cost.

Exactly What I Needed

Plugs in and tells me precisely what the battery charge and alternator activity are. Acts like the old-time dash amp meter used to (don't know why the manufacturers eliminated that). Switch from car to car to check charging situation. It seems very accurate.

Great real-time monitor for elec/charging system

Best battery monitor in it's class, and the purchase through Walmart was flawless.

Innova 3721 Battery and Charging System Monitor

How do you want your item?

OEMTOOLS 24359 Digital Battery Analyzer, Heavy Duty Battery Tester, Cranking Power and Charging System Tester, Quick and Easy Car and Truck Battery Tester