StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Power Tool Batteries
Aslersai
21V Battery
Aslersai

21V Battery

3(2 ratings)

Best price now

$22.99at WalmartChecked Nov 12

Prices are checked against each store and labelled with when.

Visit Walmart

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Last seen at $22.99 at Walmart on Nov 12.

Our take on the 21V Battery

The Aslersai 21V 1500mAh is a replacement battery pack for cordless yard and garden tools such as weed eaters, blowers, pruning shears and small chainsaws. It uses a 21V, 1.5Ah cell pack in an ABS and metal housing, and the brand pitches it as a spare so you can keep working while another pack charges. Its capacity is modest next to 21V packs rated 3Ah and up, so expect shorter run time per charge than those, but it is a simple way to add a second pack to a tool you already own. The main risk is fit: it is sold as widely compatible, but 21V tools use several different connector designs, so check the battery interface on your tool before buying.

Best forOwners of 21V cordless yard tools who want a spare packLight trimming and blowing jobsKeeping a second pack charged while one runsBudget-minded replacement for a worn pack
Pros
  • 21V, 1.5Ah pack sized for common cordless garden tools
  • Rechargeable and reusable
  • ABS and metal housing
  • Compact footprint at about 4.5 by 3 by 2 inches
  • Works as a spare to cut charging downtime
Cons
  • 1.5Ah capacity is small, so run time per charge is short
  • "Wide compatibility" claim is vague; connector type is not specified
  • No charger included
  • No stated cell brand or cycle-life rating
  • Color can differ slightly from images

21V Battery prices at every store

  • WalmartNew

    In stockSold by AslersaiReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $22.99+ $8.99 shippingChecked Nov 12
    Visit Walmart

About the 21V Battery

This is a 21V rechargeable replacement battery for power tools, with a capacity of 1500mAh. It works as a spare, so you can swap it in when the battery in a tool such as a weed eater runs low.

The housing is made of ABS and metal. The battery is intended for home power tools such as electric lawn mowers, weed blowers, electric pruning shears and electric chain saws.

Voltage
21V
Capacity
1500mAh
Type
Rechargeable replacement power tool battery
Material
ABS, metal
Color
Black
Dimensions
Approx. 11.5 cm L x 7.5 cm W x 5 cm H (4.53" x 2.96" x 1.97")
Compatibility
Home power tools such as electric lawn mowers, weed blowers, electric pruning shears, electric chain saws and weed eaters
In the box
1 x Power Tool Battery

Specifications

size
21V 1500mAhSource
color
BlackSource

Questions and answers

Will this battery fit my 21V weed eater?
Only if your tool uses the same connector as this pack. The listing calls it widely compatible but does not name the connector type, so compare the battery slot and terminals on your tool with this pack before buying.
How long does it run on one charge?
It is a 1500mAh pack, which is on the small side for 21V yard tools. Expect shorter run time than 3Ah or larger packs, and plan on swapping packs for bigger jobs.
Is a charger included?
No. The package contains one power tool battery only, so you need a charger that fits this pack's connector.
Is this a genuine replacement for my tool brand's battery?
It is an Aslersai-branded replacement, not an original equipment pack. It is sold as a compatible substitute, so check the connector and voltage match your tool.
What tools is it meant for?
The brand lists electric lawn mowers, weed blowers, pruning shears and electric chainsaws. Any 21V tool with a matching connector is the intended use.
Where is the 21V Battery cheapest?
At Walmart, for $22.99, as of our latest check.
What do buyers say about the 21V Battery?
Rated 3 out of 5 from 2 ratings.

Shoppers also compared

  • S
    Steelite 21V 4.0Ah Li-Ion Battery
    Steelite 21V 4.0Ah Li-Ion Battery
  • 2
    21v Lithium Battery - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower
    21v Lithium Battery - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower
  • B
    Blütezeit 21V 4.0Ah Lithium Battery for Cordless Leaf Blower
    Blütezeit 21V 4.0Ah Lithium Battery for Cordless Leaf Blower
  • 2
    21v Lithium Battery - 2.0 Ah Battery with Charger Adapter Led Indicator
    21v Lithium Battery - 2.0 Ah Battery with Charger Adapter Led Indicator
  • S
    Saker 21V MAX 4.0Ah Lithium Ion Battery 1-Pack
    Saker 21V MAX 4.0Ah Lithium Ion Battery 1-Pack
  • S
    SHINTYOOL 21v Lithium Battery and Single Port Rapid Charger Base - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower
    SHINTYOOL 21v Lithium Battery and Single Port Rapid Charger Base - 4.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower
  • S
    SEESE 21V Max Lithium Battery Pack
    SEESE 21V Max Lithium Battery Pack
  • S
    SHINTYOOL 21v Lithium Battery and Single Port Rapid Charger Base - 2.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower and Mini Chainsaw
    SHINTYOOL 21v Lithium Battery and Single Port Rapid Charger Base - 2.0 Ah Battery with Charger Adapter Led Indicator Compatible with Leaf Blower and Mini Chainsaw

More power tool batteries

  • 2
    21V Replacement Lithium Battery for Power Tools
    21V Replacement Lithium Battery for Power Tools
  • L
    Lithium Battery with Display for Leaf Blower and Mini Saw
    Lithium Battery with Display for Leaf Blower and Mini Saw
  • G
    GAOLLY KHKFY 21V 2.0Ah Replacement Battery Pack
    GAOLLY KHKFY 21V 2.0Ah Replacement Battery Pack
  • S
    Steelite 21V 2.0Ah Lithium Ion Battery Pack
    Steelite 21V 2.0Ah Lithium Ion Battery Pack
  • G
    Great Choice Products 21V Max 4.0Ah Lithium-Ion Battery
    Great Choice Products 21V Max 4.0Ah Lithium-Ion Battery
  • G
    Great Choice Products 21V 2.0Ah Lithium-Ion Rechargeable Battery with LED Indicator
    Great Choice Products 21V 2.0Ah Lithium-Ion Rechargeable Battery with LED Indicator
  • B
    Black+Decker LBXR20 20V 6.0Ah Battery 2-Pack with USB Output
    Black+Decker LBXR20 20V 6.0Ah Battery 2-Pack with USB Output
  • R
    Ryobi PGC21B Battery
    Ryobi PGC21B Battery