For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
Upgrade your 8-Channel Lithium Battery Tester to support 21700 cells with this dedicated 4-slot adapter module.
This expansion base allows your native 18650 tester to properly fit and test 21700 lithium-ion cells. The module replaces the standard 18650 holders and provides the correct spacing and mechanical support required for accurate and stable testing of 21700 batteries.
Important
Each module supports 4 cells only.
To fully convert an 8-channel tester for 21700 use, you need 2 modules.
This is a mechanical adapter base. It does not include the tester.
Why You Need It
If you are testing modern high-performance 21700 cells such as Samsung 50S, Molicel P45B, EVE 50PL, JP40, JP50, or similar models, proper cell contact and alignment is critical for accurate internal resistance and capacity readings.
Trying to fit 21700 cells in 18650 slots leads to poor contact, unstable readings, and possible mechanical stress. This adapter solves that cleanly.
Key Features
• Designed specifically for the 8-Channel 18650 Lithium Battery Tester
• Supports 21700 lithium-ion cells
• 4 independent slots per module
• Strong mechanical support and proper terminal alignment
• Plug-and-play installation
• Clean and professional fit
Compatibility
Compatible with the 8-Channel 21700/18650 Lithium Battery Auto Charge/Discharge Tester sold on DIY500AMP.COM.
Not compatible with other testers unless dimensions match exactly.
What’s Included
• 1x 4-Slot 21700 Adapter Module
To convert the full 8-bay tester, order quantity: 2
Important Notes
• Tester not included
• Power supply not included
• For 8-cell 21700 testing, two modules are required
• External discharge function remains available through the tester
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
Payment and Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
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Let customers speak for us
Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
VN in AZ
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