These worked great, definitely a fan
Key Features
- High Power Output: 35A continuous discharge supports demanding electronic systems.
- 3000mAh Capacity: Delivers strong runtime without sacrificing performance.
- Flat Top Terminal: Designed for use in battery packs and custom builds.
- 21700 Size: Offers improved efficiency compared to smaller cell formats.
- Rechargeable Design: Built for repeated use with consistent output.
Overview
The Samsung 30T 21700 battery delivers exceptional power in a compact, high-performance cell. Built to handle heavy current demands, this battery provides a strong 35A continuous discharge while maintaining a reliable 3000mAh capacity. Its flat top design makes it a dependable choice for professional battery assemblies and high-power applications.
Applications / Uses
- High-demand power tools
- Portable industrial equipment
- Electric transportation systems
- Energy storage packs
- Custom lithium-ion battery builds
SPECIFICATIONS
| Manufacturer: | Samsung SDI |
| Model: | INR21700-30T |
| Battery Size: | 21700 |
| Positive Terminal: | Flat Top |
| Nominal Capacity: | 3000mAh |
| Max Continuous Discharge: | 35A |
| Nominal Voltage: | 3.6V |
| Maximum Voltage: | 4.2V |
| Discharge Cut-Off Voltage: | 2.5V |
| Protected: | No, unprotected |
| Rechargeable: | Yes |
| Approx. Dimensions: | 21.1mm × 70.2mm |
| Approx. Weight: | 68.2g |
| Data Specification Sheet: | Samsung 30T Datasheet |
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or for e-cigarettes, vaporizers, or similar devices.
-
Thermal Runaway: A chain reaction where heat from a failing battery
causes further overheating, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. Continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger specifically designed for lithium-ion batteries and ensure the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
-
Prohibited Activities:
- Do not expose the battery to extreme heat, fire, or liquids.
- Do not short circuit, puncture, crush, or modify the battery.
- Do not charge or discharge beyond the manufacturer’s voltage range.
- Do not dispose of in regular trash—always recycle at approved facilities.
- Emergency Response: If a cell shows signs of thermal runaway (e.g., smoke, swelling, hissing, or heat), stop use immediately and, if it can be done safely, move it to a non-flammable surface (e.g., concrete or sand) away from combustible materials. Lithium-ion cells burn as Class B fires — use an ABC / dry-chemical fire extinguisher, or douse with large amounts of water to cool the cell and prevent the fire from spreading. Do not rely on a small spray; thorough cooling is required, and cells can reignite from residual heat, so monitor the area afterward. (Class D extinguishers are intended for lithium-metal batteries, not lithium-ion.) For any fire beyond a single small cell, evacuate and call emergency services.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.9 / 5 from 451 reviews.
Good
I have several of the golisi 21700 and several of the 30ts. Both are awesome but the golisi wont fit in a few of my mods. The 30ts have never failed me and are one of the best.
I bought these for my AV Kane and my Purge Side Piece and they've been great so far. I build @ +/- .2 ohms and they've proven to fulfill my requirements. :sunglasses::+1:
I am definitely going to buy more leave that 70 watts .2 ohms I get a full day out of them they charged up nice really great battery
Love these for my mech mod would highly recommend them to any mech user great price 2
Great batteries! Love them in my recurve
Powerful and long lasting battery.
Obviously, as we all know, these cells are better than any cell on the planet atm. They especially shine bright in a mechanical, unregulated setup. Remember guys, batteries are shipped via ground now and take longer to get to your door nowadays. Cheers!
The item was exactly as described and delivered quickly.
Fast delivery, batteries came as described. Still working to replace my Dewalt Flex volt cells. The cells I received are the exact ones needed for replacement. Should finish the task in short order. Thanks for the replacement cells.
Great product
The batteries arrived as expected. I installed the 2 21700's my 20v Dewalt battery pack that wouldn't hold a charge, charged them up and used it in my weed eater with no issues. The pack didn't get warm and seemed to work like new.
5 stars! Prompt, excellent company. Thank you very much.
Thanks
I had a 6ah dewalt battery that wouldn't hold a charge. So, after taking it apart and getting the old multimeter out I found that it only had 2 bad cells. I ordered 2 Samsung 30T 21700 and spot welded them in and it worked like new. I'll definitely return here because I use alot of 18650 and 21700 batteries.
Perfect replacement. Thank you for the fast shipping.
Really love the product. I'm going to buy more batteries from them.
Great batteries
PERFECT
Everything is great! Thank you
Does the job right.
Batteries work great. Had all my dewalt packs refurbished for a fraction of the price.
Worked as is should. A+
Batteries appeared as of good quality and worked great as a replacement for bad cells in my dewalt 20V battery pack.
I ordered exactly what it says on my current vape battery and these are way too big.
They work well good lasting time
They don't hold a charge aas long as my older batteries
They work as advertised, great product!
Great battery, great price
Batterys came before expected, all packaged well. Installed in Dewalt battery and tested perfectly. Well buy again
We’re good battery!
We�re good battery!
Good batteries. Fast charging time. Use them at work in my armour max at 50 watts and they last several days before they need charged again.
Top of the line. Very satisfied
Works good last a while
Lower capacity and less runtime than my 2 year old 30T batteries. Are these genuine?
I used these batteries in my vape mod they last me 12 hours before I need to charge again
Great battery one of the best
I'm thoroughly impressed by the Samsung 30T 21700 batteries. They power my VV Gaur mod perfectly!