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24 -Volt 1 -Pack Battery ( 3.5 Ah Lithium-ion )

Ratings & Reviews for FLEX 24 -Volt 1 -Pack Battery ( 3.5 Ah Lithium-ion )

4.8
320
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Review
  4.8 out of 5
320 Reviews


95% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The Flex 3.5 stacked lithium battery is praised for its long-lasting power, fast charging, and compact yet powerful design. Customers report the battery is durable, provides excellent runtime, and works well with various Flex power tools. Many note it outperforms the regular Flex batteries and offers great value. While a few experienced issues with leakage or shorter lifespan, the majority of reviews are very positive, indicating the battery is a reliable and high-quality product.

Customer review summary generated by AI, including incentivized reviews.
320 Customer Reviews

No more black goo.

 Would Recommend

Never owned a Flex tool until my neighbor gifted me one. It was amazing until the 5ah battery started leaking the infamous black liquid. I tried having it replaced but couldn't since I didn't have a receipt. Now that battery won't charge so I had to buy this 3.5ah stacked lithium as a replacement. I hope it lasts much longer than the first one.

August 22, 2026

From flexpowertools.com

24v 3.5Ah Stacked battery

 Would Recommend

Fantastic battery. Great for DIY home projects. Highly recommend

August 14, 2026

From flexpowertools.com

Don't think about it. Just do it!

 Would Recommend

Flex tools are awesome! Totally changed my mind on power tools. They last forever and charge quick! I'm almost converted from Milwaukee now.

July 22, 2026

From flexpowertools.com

Great power

 Would Recommend

The Stacked Lithium batteries work very well. Never a power issue and plenty of run time.

April 5, 2026

From flexpowertools.com

Flex batteries rock!

These batteries last and recharge fast. It is great to have tools made to work as hard as I do.

March 12, 2026

From flexpowertools.com

Great power

 Would Recommend

Works great for all my flex 24v tools. Glad I went with this brand

March 6, 2026

From flexpowertools.com

3.5Ah Stacked battery is a BEAST!

 Would Recommend

charges super quickly and has good power. Feels super high quality and heavy duty.

February 27, 2026

From flexpowertools.com

My Favorate Flex battery.

 Would Recommend

To me this is the perfect battery. Very light in weight with plenty of power. This and the 6.0 ah are my two favorites.

February 8, 2026

From flexpowertools.com

Awsome tools

 Would Recommend

Best tools

February 8, 2026
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Best battery Available.

 Would Recommend

Best battery on the market. No other brand comes close.

February 6, 2026

From flexpowertools.com