HART 40 Volts 4.0Ah Lithium-Ion Battery
HART 40 Volts 4.0Ah Lithium-Ion Battery
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HART 40 Volts 4.0Ah Lithium-Ion Battery

4 stars out of 235 reviews
(4.0)|
235 ratings

Key item features

  • Compatibility: Works with all HART 40V tools
  • Advanced Technology: Lithium-Ion battery offers more power and longer life with zero "memory" effect
  • High Capacity: 4.0Ah battery provides better runtime and power for demanding tools like mowers, chainsaws, and blowers
  • Convenient Design: Slim design reduces fatigue for a more comfortable experience
  • On-Board Fuel Gauge: Allows quick charge checks at any moment
  • Included Items: Comes with a 40V 4.0Ah Battery and Operator Manual
  • Model Information: Model number HLBP021A
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Current price is Now $128.00
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was $158.00
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About this item

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Customer ratings & reviews

4 out of 5 stars
stars235 ratings142 reviews
How item rating is calculated
  1. 5 stars63% (148)
  2. 4 stars12% (28)
  3. 3 stars5% (12)
  4. 2 stars6% (13)
  5. 1 star14% (34)

Reviews summary

Pros
  • : Can cover entire yard with one charge.
  • : Lasts for an extended period on a single charge.
  • : Provides lasting power for task completion.
Cons
  • : Costs more than similar products or tools.
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Showing 1-3 of 142 reviews

Jul 12, 2020
millrat0259
Top Reviewer
5 out of 5 stars review

Great battery for 40V HART tools

I got this HART 40-Volt 4.0Ah Battery Accessory, Lithium-Ion, On-Board Fuel Gauge to use with my HART 40V tools. Now I can use them longer by having two batteries charged up and ready to use while I am using my HART string trimmer, blower and chainsaw. Now I can know I can complete my job without running out of battery charge. I love thatthis batter is so powerful. It features the fad free lithium Ion technology and gives consistent power that lasts a long time and lets me complete what I am doing. And, the On Board Fuel Gauge lets me check the charge at a glance so I can know when it is time to switch batteries. I really love how durable this battery is and how it should last a very long time. And it is compatible with all of the HART 40V tools, so I do not have to have separate batteries for each tool, which saves me money and space, both of which are important to me. I feel better knowing I do not have to use gas with my tools. It is sold separately from any tool, and does not include a charger. I do recommend this battery.

Incentivized Review
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Jul 31, 2025
Ken
Top Reviewer
5 out of 5 stars review

Verified Purchase

Yes for HART batteries…

If a battery on line looks like HART but doesn't have the Hart logo on it do not order it, others just don't fit the Hart products. Hart are good products from Walmart, dependable.

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Jul 15, 2020
NanaB
5 out of 5 stars review

Powerhouse of a battery

Hart 4Ah 40V Lithium Ion Battery The Hart 4Ah 40V Lithium Ion Battery is a powerhouse. It holds a charge for a very long time. It is easy to recharge. You put it in a docking station and plug it in a 110 volt electrical outlet. The docking station comes with a Hart tool such as a mower, blower, trimmer, or edger. The battery is easy to install. It fits well onto multiple tools that are made by Hart. The battery is heavy enough that it helps distribute the weight of the tool it’s installed on. It is a well engineered battery. This battery powers tools that increase the joy of mowing, blowing, and trimming without the noise of gas machines or dragging around electrical cords. I have an edger by Hart and am looking forward to getting the Hart blower and Hart trimmer that this battery can attach to. It also fits a mower. The whole system that the Hart 4Ah 40V Lithium Ion Battery works on is well engineered by Hart. It even lets you know when the battery is running low with it's onboard gauge.

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