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expiredItsSoCheap | Staff posted May 01, 2025 09:13 AM
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expiredItsSoCheap | Staff posted May 01, 2025 09:13 AM

DeWalt 1-Amp Battery Charger & Battery Maintainer

$13

$20

35% off
Amazon
30 Comments 21,155 Views
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Deal Details
Amazon has DeWalt 1-Amp Battery Charger & Battery Maintainer for use w/ 20V DeWalt Lithium Battery Pack (DXAEOBD) on sale for $12.56. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter ItsSoCheap for finding this deal.

Features:
  • Maintain your vehicle's battery using your own DeWalt 20 volt lithium battery packs (not included)-- When switching the DeWalt 20V battery pack, please make sure to wait three minutes before installing a new battery pack to assure the unit operates properly.
  • Battery Maintainer is compatible with any AGM, GEL or WET battery
  • Charges via the OBD-II port inside your vehicle
  • Ruggedly constructed with an impact-resistant polymer housing
  • Maintains car settings while charging your car battery for systems such as radio, seats, clock and dashboard settings
  • Also works with the DeWalt FlexVolt battery on the 20V setting

Editor's Notes

Written by SlickDealio
  • About this deal:
    • Our research indicates that this offer is $24.43 lower (66% savings) than the next best available price from a reputable merchant with prices starting from $36.99
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion. 
  • About this store:

Original Post

Written by ItsSoCheap | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has DeWalt 1-Amp Battery Charger & Battery Maintainer for use w/ 20V DeWalt Lithium Battery Pack (DXAEOBD) on sale for $12.56. Shipping is free w/ Prime or on $35+ orders.

Thanks to Deal Hunter ItsSoCheap for finding this deal.

Features:
  • Maintain your vehicle's battery using your own DeWalt 20 volt lithium battery packs (not included)-- When switching the DeWalt 20V battery pack, please make sure to wait three minutes before installing a new battery pack to assure the unit operates properly.
  • Battery Maintainer is compatible with any AGM, GEL or WET battery
  • Charges via the OBD-II port inside your vehicle
  • Ruggedly constructed with an impact-resistant polymer housing
  • Maintains car settings while charging your car battery for systems such as radio, seats, clock and dashboard settings
  • Also works with the DeWalt FlexVolt battery on the 20V setting

Editor's Notes

Written by SlickDealio
  • About this deal:
    • Our research indicates that this offer is $24.43 lower (66% savings) than the next best available price from a reputable merchant with prices starting from $36.99
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion. 
  • About this store:

Original Post

Written by ItsSoCheap | Staff

Community Voting

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+20
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Model: DeWalt DXAEOBD Professional 1 Amp Battery Maintainer for Use with 20V DeWalt Lithium Battery Pack

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Sort: Lowest to Highest | Last Updated 10/10/2025, 07:34 AM
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Top Comments

alphawave
1468 Posts
251 Reputation
It does. It monitors the charge state (V, mV) of your car/truck battery, and when it detects a drop in voltage, should send a corresponding current, up to 1 Amp, to top up the battery. The main use case is if you don't run your auto for more than a few weeks (eg. travel, use other transit), it would help to ensure your battery remains charged, especially when another low parasitic charge is being drawn, like a car alarm or other electronics that would end up discharging your battery over time.
BadgerStabber
1103 Posts
218 Reputation
It's basically a trickle charger. Sends 1amp to the battery to maintain the car battery at 12.5v. Will also keep power to the interior electronics when you change out a car battery to keep from dropping memory/presets.

Ideal if you have a parasitic draw on a vehicle that you may not drive very often.

It's ok if you don't understand 12v systems and what exactly a trickle charger is.
VSeven
1654 Posts
470 Reputation
That's like the recipe reviews that say "I substituted half the sugar for apple sauce since I thought it was too much and used bread flour instead of all purpose since I was out and these muffins just didn't come out right. 2/5 stars"

29 Comments

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May 01, 2025 11:22 AM
7,282 Posts
Joined Dec 2006
big mikeMay 01, 2025 11:22 AM
7,282 Posts
Good price but the terrible reviews should make you think twice. Though part of that may be user error, it seems like a lot of folks are using this as a long term solution which it arguably isn't designed to be, and hot swapping the batteries, which is apparently a no-no.
May 01, 2025 01:27 PM
1,654 Posts
Joined Apr 2004
VSevenMay 01, 2025 01:27 PM
1,654 Posts
Quote from big mike :
Good price but the terrible reviews should make you think twice. Though part of that may be user error, it seems like a lot of folks are using this as a long term solution which it arguably isn't designed to be, and hot swapping the batteries, which is apparently a no-no.
That's like the recipe reviews that say "I substituted half the sugar for apple sauce since I thought it was too much and used bread flour instead of all purpose since I was out and these muffins just didn't come out right. 2/5 stars"
5
2
May 01, 2025 03:52 PM
103 Posts
Joined Jan 2011
HGUHMCQ33May 01, 2025 03:52 PM
103 Posts
Excuse my ignorance… but what does this exactly do? I've read it, and still don't know..lol
1
May 01, 2025 04:02 PM
15 Posts
Joined Mar 2021
FabulousCrow3509May 01, 2025 04:02 PM
15 Posts

Our community has rated this post as helpful. If you agree, why not thank FabulousCrow3509

Quote from HGUHMCQ33 :
Excuse my ignorance… but what does this exactly do? I've read it, and still don't know..lol
Automatically maintains optimum battery level of your 12V AGM, GEL and WET batteries
1
May 01, 2025 04:12 PM
748 Posts
Joined Oct 2013
DanweiDMay 01, 2025 04:12 PM
748 Posts
Quote from FabulousCrow3509 :
Automatically maintains optimum battery level of your 12V AGM, GEL and WET batteries
So adding a tiny tool battery to your car's massive battery? I'm sure it will help
6
May 01, 2025 04:27 PM
1,468 Posts
Joined Dec 2005
alphawaveMay 01, 2025 04:27 PM
1,468 Posts

Our community has rated this post as helpful. If you agree, why not thank alphawave

Quote from DanweiD :
So adding a tiny tool battery to your car's massive battery? I'm sure it will help
It does. It monitors the charge state (V, mV) of your car/truck battery, and when it detects a drop in voltage, should send a corresponding current, up to 1 Amp, to top up the battery. The main use case is if you don't run your auto for more than a few weeks (eg. travel, use other transit), it would help to ensure your battery remains charged, especially when another low parasitic charge is being drawn, like a car alarm or other electronics that would end up discharging your battery over time.
2
1
May 01, 2025 04:36 PM
1,103 Posts
Joined Jan 2016
BadgerStabberMay 01, 2025 04:36 PM
1,103 Posts
Quote from DanweiD :
So adding a tiny tool battery to your car's massive battery? I'm sure it will help
It's basically a trickle charger. Sends 1amp to the battery to maintain the car battery at 12.5v. Will also keep power to the interior electronics when you change out a car battery to keep from dropping memory/presets.

Ideal if you have a parasitic draw on a vehicle that you may not drive very often.

It's ok if you don't understand 12v systems and what exactly a trickle charger is.
2

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May 01, 2025 04:37 PM
303 Posts
Joined Nov 2010
chaimavMay 01, 2025 04:37 PM
303 Posts

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Quote from DanweiD :
So adding a tiny tool battery to your car's massive battery? I'm sure it will help
Lithium ion is a lot more energy dense that lead acid. A 50 amp hour battery has about 600 watt hours (50 * 12). A DeWalt 4 amp hour battery has about 72 watt hours (~18*4, 20 volts is the max not nominal). So that means an over 10% increase in energy. It's enough that if you leave your car in the airport for 3 weeks it is more likely to start up again.
1
1
May 01, 2025 04:39 PM
1,048 Posts
Joined Sep 2022
TealIdea227May 01, 2025 04:39 PM
1,048 Posts
I'm invested in BatteryMINDers and extension cords, and not in Dewalt batteries. $12.56 is not a high price to have this capability ... but not having a two-pin plug is a huge limitation, along with remembering to check the battery over time. Probably best just to consider this purely a "MEMORY SAVER- Maintains car settings while charging your car battery for systems such as radio, seats, clock and dashboard settings".

Yeah, the "airport" suggestion sounds good.
May 01, 2025 05:01 PM
110 Posts
Joined Jan 2022
TenderJoke7900May 01, 2025 05:01 PM
110 Posts
Quote from chaimav :
Lithium ion is a lot more energy dense that lead acid. A 50 amp hour battery has about 600 watt hours (50 * 12). A DeWalt 4 amp hour battery has about 72 watt hours (~18*4, 20 volts is the max not nominal). So that means an over 10% increase in energy. It's enough that if you leave your car in the airport for 3 weeks it is more likely to start up again.
I think you nailed it.

I was trying to think of the use case, why would I want this instead of a trickle charger. And the answer would be when I didn't have any place to plug in a trickle charger.
May 01, 2025 05:30 PM
806 Posts
Joined Dec 2004
gridStormMay 01, 2025 05:30 PM
806 Posts
Quote from TealIdea227 :
I'm invested in BatteryMINDers and extension cords, and not in Dewalt batteries. $12.56 is not a high price to have this capability ... but not having a two-pin plug is a huge limitation, along with remembering to check the battery over time. Probably best just to consider this purely a "MEMORY SAVER- Maintains car settings while charging your car battery for systems such as radio, seats, clock and dashboard settings".Yeah, the "airport" suggestion sounds good.
Agree. What if the vehicle doesn't have OBD? Can we hack to just get 12v? I suspect it's "too smart" though
May 01, 2025 06:06 PM
7,282 Posts
Joined Dec 2006
big mikeMay 01, 2025 06:06 PM
7,282 Posts
FWIW one of the actual main intended uses for this is for mechanics, you use these when swapping a battery so you don't lose presets and have to reinitialize windows and all kinds of other crap on a modern car if you lose 12v power for too long. At 13 bucks I jumped in on one for giggles and if I have to leave a car sit.
1
May 01, 2025 06:19 PM
765 Posts
Joined Jun 2022

This comment has been rated as unhelpful by Slickdeals users.

May 01, 2025 07:06 PM
520 Posts
Joined May 2014
MONM5993May 01, 2025 07:06 PM
520 Posts
Quote from TenderJoke7900 :
I think you nailed it.

I was trying to think of the use case, why would I want this instead of a trickle charger. And the answer would be when I didn't have any place to plug in a trickle charger.
Yeah. Like a the airport if you going away for a while. If I have a place with sun, I just attached a solar one onto the battery.

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May 01, 2025 07:10 PM
520 Posts
Joined May 2014
MONM5993May 01, 2025 07:10 PM
520 Posts
Quote from RelaxedPenguin2752 :
This is a great idea but I see a few issues . A. 1amp (atleast 2amps I'd say) really ain't enuf to hold the cars memory or slowly charge/maintain a battery , B. according to this you can only charge through a obd 2 port? I personally own a car with no obd port I'd like to use this on ,not to mention obd1 (Mc , dirt bikes boats , jet skis etc) I can get past 1amp why wouldn't they make it with clamps also ?
Since is only 2 wires, you can just get a female ODB 2 port and connect that directly to the battery. You could also just cut the wire and attached the ends to some kind of DC plug so you can still use it with an ODB 2 later.

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