-60%

$16.71

100A Four-Wire Battery Test Stand, 18650 21700 Internal Resistance Tester Bakelite-A79M

🏬 Sold by SyncHome Appliance Store

✅ High current capacity up to 100A
✅ Four-wire Kelvin sensing for accuracy
✅ Fits 18650 and 21700 battery cells

👤 Ideal for professionals performing high-load capacity and internal resistance testing on cylindrical lithium cells.

$16.71$41.78Save 60%

Price updated 12 Oct 2026

🚚 Shipping to Israel: $1.00 · 8–21 days (live from AliExpress)

Get the most out of your batteries with this high-performance test stand for 18650 and 21700 cells. Perfect for tech enthusiasts and professionals, it provides accurate four-wire testing for capacity and internal resistance. Ensure your power projects always run smoothly.

🛒 Buy now on AliExpress →

📋 Full specs, sizes, materials & detailed description - on the AliExpress product page →

🌍 Ships worldwide via AliExpress with a tracking number. Any local import taxes (if any) are set by your country's customs, not by InstaShop.

📈 Price historyTracked daily since 28 Sept · 15 days

28 Sept12 Oct

Lowest

$15.29

Highest

$16.79

$16.71

⚠️ Higher than usual - consider waiting

Over 15 days of daily tracking (since 28 Sept) the price ranged from $15.29 to $16.79. Today: $16.71.

Based on InstaShop's daily price tracking of AliExpress. The final price is set by AliExpress.

💡 Why buy · InstaShop analysis

👤 Best for: Ideal for professionals performing high-load capacity and internal resistance testing on cylindrical lithium cells.

🔎 Check before buying: Verify that your external testing equipment is compatible with 100A current loads.

💰 Is the price good? AliExpress lists 60% off, but in our daily tracking the price is higher than usual right now - consider waiting.

🚚 Worldwide shipping - usually 2–4 weeks with a tracking number. Some sellers offer faster paid shipping.

⭐ Quality & trust: this product does not have enough AliExpress buyer reviews yet. Check the reviews with photos on the product page before buying.

🔒 Secure checkout - payment and purchase happen on AliExpress with Buyer Protection and a refund if the item never arrives / isn't as described.

💡 Before buying - on the product page check reviews with real photos, shipping time to your country, and sizes/specs if relevant.

What AliExpress buyers say

There are not enough AliExpress ratings for this product yet. Check the reviews with photos on the product page before buying.

See reviews on AliExpress →

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🔍 In-depth analysis

This analysis is written with an AI model from the product data (name, category, price, rating and orders), not from a hands-on test. How we choose and score

This professional-grade battery testing stand is designed for users who need more than a simple charger. It functions as a comprehensive diagnostic tool, capable of measuring charging capacity, discharge rates, and internal resistance. While many standard chargers provide basic status updates, this unit is positioned as a specialized station for analyzing cell health and performance. Its physical layout suggests a more robust interface than consumer-level devices, making it suitable for those who work with various rechargeable cells frequently.

However, potential buyers should note that this specific listing currently lacks a history of orders and buyer ratings. While the current discount is substantial compared to the original listed price, the absence of community feedback means you are relying entirely on the seller's description. It appears to be a high-functionality device at a competitive entry point, but it requires a 'pioneer' mindset since the long-term reliability and accuracy haven't been verified by other users yet.

✅ Pros

Multifunctional design that combines charging, discharging, and resistance testing in one station.
High value-to-feature ratio given the current deep discount from the original list price.
Professional-style interface that allows for more detailed monitoring than standard plug-and-play chargers.

Cons and cautions

Zero order history or buyer reviews make it difficult to verify the accuracy of the sensors.
Lack of detailed technical specifications regarding cooling and maximum wattage in the primary listing.

From our data

Paid shipping to Israel: $1.00 (per the AliExpress shipping quote)
Delivery to Israel can take up to 21 days
No buyer rating yet

Who it's for: This device is ideal for DIY electronics hobbyists, RC enthusiasts, or anyone rebuilding battery packs for power tools and e-bikes. It is specifically for people who need to match cells based on internal resistance and actual discharge capacity.

Who should skip it: This is not for the casual home user who simply needs to juice up some AA batteries for a remote. It is likely too complex for those without a basic understanding of battery chemistry and safety.

🔎 Check before you buy

Verify the maximum discharge current and voltage range with the seller to ensure it fits your specific cells.
Ask if the unit requires an external power supply or if one is included in the package.
Confirm which battery chemistries (Li-ion, NiMH, LiFePO4) are natively supported by the firmware.
Request the physical dimensions of the battery slots to ensure compatibility with larger cells like 21700 or 26650.

💰 Value verdict: At the current price point, this tester offers a lot of potential utility for the cost. The discount is significant, making it an affordable way to get professional-style diagnostic features. However, the lack of social proof means the buyer assumes some risk regarding build quality and precision.

💡 Tips

Message the seller to ask for a digital copy of the user manual before purchasing to understand the interface.
When first using the device, test it with an old, known cell to verify that the readings are consistent.
Always monitor the unit during high-current discharge cycles to ensure the heat dissipation is working correctly.

Questions about this product

Can this device test the internal resistance of any battery?

It is designed for common rechargeable cells; however, you should confirm with the seller which specific sizes and chemistries the internal resistance feature supports.

Does this unit connect to a PC for data logging?

The listing does not specify PC connectivity. You should verify with the seller if there is a USB data port or if results are only shown on the built-in display.

Is the power cable included?

Packaging details are not provided. It is important to ask the seller if it comes with a power adapter and which plug type is provided.

❓ Questions & Answers

Does it ship to my country?

Yes. The item ships worldwide via AliExpress, usually within 2–4 weeks, with a tracking number.

Are there customs or taxes?

Import duty/VAT depends on your country's rules and the order value. Any local charges are set by your customs authority, not by InstaShop.

How do I return an item if something is wrong?

Purchases are made on AliExpress with Buyer Protection - you can open a dispute and get a refund if the item never arrives or is not as described, typically within 15 days of delivery.

Is the price final?

The price shown is the product price on AliExpress. Shipping and any local import taxes (if applicable in your country) are separate.