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AliExpress Z99 Portable 18650 Battery Spot Welder Kit
AliExpress Z99 Portable 18650 Battery Spot Welder Kit, view 2AliExpress Z99 Portable 18650 Battery Spot Welder Kit, view 3AliExpress Z99 Portable 18650 Battery Spot Welder Kit, view 4AliExpress Z99 Portable 18650 Battery Spot Welder Kit, view 5AliExpress Z99 Portable 18650 Battery Spot Welder Kit, view 6
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Z99 Portable 18650 Battery Spot Welder Kit

$3.89$8.10Save 52%

In stock at aliexpress.com

A Z99 portable spot welder kit running on 12V with 99 adjustable power levels and voltage monitoring, used to weld nickel strips onto 18650 lithium-ion cells. It costs $3.89, which is very cheap for a welder. The seller reports nearly 1,900 orders and 98% positive feedback on AliExpress.

Shop now at AliExpress →

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Price from AliExpress at our last check (refreshed weekly). The final price, shipping and any import charges show at AliExpress checkout. We may earn a commission if you buy.

Highlights

  • 12V portable spot welder
  • 99-level power adjustment
  • Voltage monitoring
  • For 18650 battery pack building

Best for

Experienced DIYers who build small battery packs and want an inexpensive welding controller.

Things to consider

  • Welding lithium cells is risky; shorts and bad welds can cause fires.
  • You'll need a separate 12V power source such as a car battery or high-current supply.
  • At this price the kit may omit probes or cables.

Key specs

Price$3.89
Voltage12V
Power levels99
Use18650 spot welding

Our take

A cheap but risky tool. Only buy if you know battery safety, and check what is in the box.

Z99 Portable 18650 Battery Spot Welder Kit at a glance

BrandAliExpress
Price$3.89 (was $8.10)
TypeWelding Equipment & Supplies
AvailabilityIn stock at aliexpress.com
ReturnsEligible items can be returned within 90 days of payment, with the first return on each…

Price check

At $3.89, the Z99 Portable 18650 Battery Spot Welder Kit is mid-range for AliExpress, whose 51,717 listed products run $1 to $1,229.

It's currently 52% below its listed price of $8.10. Sale prices can end without notice, so check the live price before you order.

Similar items from other brands we track run $8.99 to $200.

Buying from AliExpress

AliExpress is a legitimate marketplace that is worth using for cheap, low-risk things like cables, tools, cleaning supplies and small home items, as long as you can wait and you buy from well-rated sellers. Skip it for anything safety-critical, brand-name or urgent. Check the seller's feedback score, the delivery estimate and the import-charge line at checkout before you pay.

Shipping
AliExpress's 2024 US guarantee listed Choice orders at 5 to 12 days and standard orders at 8 to 14 days, but real-world standard shipping from China often runs longer. Items marked Ship from United States come from local stock. Free shipping on Choice orders depends on a minimum order shown at checkout.
Returns
Eligible items can be returned within 90 days of payment, with the first return on each order free, according to AliExpress's 2024 US announcement. Return terms vary by seller and item, so check the product page. Custom, perishable and hygiene items are generally excluded.
Warranty
AliExpress does not publish a marketplace-wide product warranty. Coverage depends on the individual seller, and Buyer Protection covers non-delivery, damage and not-as-described claims instead.
Payment
US shoppers can pay by Visa, Mastercard, American Express or Discover, PayPal, Apple Pay and Google Pay. Instalment options such as Klarna and PayPal Pay Later appear on some orders, and availability varies.
International
AliExpress sells to shoppers worldwide. For US orders, import duties on low-value parcels have applied since the duty-free exemption ended in 2025, and state sales tax is added at checkout.

Read our full AliExpress review and shop all products →

Frequently asked questions

What do I power it with?
A 12V source that can supply high current, such as a lead-acid or lithium battery. The listing doesn't say what's included, so check the item list for cables and probes.
Is it safe for beginners?
Battery pack building is a skill. Wear eye protection, avoid shorts, and use cell holders and a battery management system.
How long does shipping to the US take?
A welder controller with cables is a small electronic parcel, normally one to three weeks. Choice or US-warehouse listings are faster. Tracking and Buyer Protection apply. Import charges may show at checkout.
Can it weld thick nickel strip?
Thin nickel strip of 0.1 to 0.15 mm is typical for these kits. The title gives no thickness limit, so check the product photos.
Is the Z99 Portable 18650 Battery Spot Welder Kit on sale?
Yes. AliExpress lists it at $3.89, down from $8.10 (52% off). Sale prices change, so confirm the live price on aliexpress.com.
Is there a discount on the Z99 Portable 18650 Battery Spot Welder Kit?
AliExpress publishes these ways to save: Coins in the app. AliExpress sets the terms, which can change; our AliExpress coupons page has the details.
What is AliExpress's return policy?
Eligible items can be returned within 90 days of payment, with the first return on each order free, according to AliExpress's 2024 US announcement. Return terms vary by seller and item, so check the product page. Custom, perishable and hygiene items are generally excluded.
How long does AliExpress take to ship?
AliExpress's 2024 US guarantee listed Choice orders at 5 to 12 days and standard orders at 8 to 14 days, but real-world standard shipping from China often runs longer. Items marked Ship from United States come from local stock. Free shipping on Choice orders depends on a minimum order shown at checkout.
Does the Z99 Portable 18650 Battery Spot Welder Kit come with a warranty?
AliExpress's published warranty terms: AliExpress does not publish a marketplace-wide product warranty. Coverage depends on the individual seller, and Buyer Protection covers non-delivery, damage and not-as-described claims instead.
Where can I buy the Z99 Portable 18650 Battery Spot Welder Kit?
The Z99 Portable 18650 Battery Spot Welder Kit is sold directly by AliExpress on aliexpress.com. The Shop now button on this page goes straight to the product there.
Is the Z99 Portable 18650 Battery Spot Welder Kit in stock?
Yes. AliExpress lists it as in stock on aliexpress.com as of our latest check. Stock and prices refresh throughout the day.
Is AliExpress a legit store?
AliExpress is a legitimate marketplace that is worth using for cheap, low-risk things like cables, tools, cleaning supplies and small home items, as long as you can wait and you buy from well-rated sellers. Skip it for anything safety-critical, brand-name or urgent. Check the seller's feedback score, the delivery estimate and the import-charge line at checkout before you pay. Our full AliExpress review covers shipping, returns and what to check before ordering.

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