The Tenergy 18650 Li-Ion 3500mAh 3.6V 10A 2 Pack Battery is a high-capacity, rechargeable power solution designed for devices requiring stable energy output. With a 10A discharge rate and 3500mAh capacity, it balances longevity and performance. Ideal for flashlights, vaping devices, and portable electronics, these batteries feature built-in safety protections and are sold in cost-effective pairs for convenience.
How to Prevent Lithium-Ion Battery Fires and Explosions
How Does the Tenergy 18650 Compare to Standard Alkaline Batteries?
Unlike single-use alkaline batteries, the Tenergy 18650 is rechargeable, eco-friendly, and delivers higher voltage (3.6V nominal vs. 1.5V). Its lithium-ion chemistry supports rapid charging and maintains consistent output under high-drain applications, making it superior for power-hungry devices like vaping mods or LED flashlights.
Alkaline batteries suffer from voltage drop as they discharge, while the Tenergy 18650 maintains a stable voltage curve until 80% depletion. This makes it particularly effective for precision devices like digital thermometers or laser levels. The lithium-ion cells also operate efficiently in temperatures from -20°C to 60°C, outperforming alkalines which typically fail below 0°C. For frequent users, the recharge capability saves money – one Tenergy pair can replace 300+ disposable batteries over its lifespan.
| Feature | Tenergy 18650 | Alkaline AA |
|---|---|---|
| Recharge Cycles | 500+ | Single-use |
| Energy Density | 250Wh/kg | 100Wh/kg |
| Cost Per Cycle | $0.008 | $0.25 |
What Safety Certifications Does This Battery Have?
Certifications include UL 1642 (safety), IEC 62133 (performance), and UN38.3 (transportation). Each batch undergoes forced discharge, crush, and thermal shock testing to meet international standards.
The UL 1642 certification specifically tests for fire hazards, requiring cells to withstand short-circuiting without explosion. IEC 62133 ensures performance stability through 500 charge cycles with less than 20% capacity loss. UN38.3 certification involves altitude simulation (15,000 feet), vibration testing equivalent to 3 hours of air freight, and impact tests with 15g acceleration. Tenergy’s cells also exceed MSDS requirements for safe handling, with nickel-plated steel casings that resist corrosion better than standard aluminum shells found in budget batteries.
| Certification | Test Parameters |
|---|---|
| UL 1642 | Overcharge at 10V for 7 hours |
| IEC 62133 | 130°C thermal abuse test |
| UN38.3 | 8% SOC vibration at 15Hz |
“The Tenergy 18650 stands out for its cycle life consistency. In our stress tests, it maintained 82% capacity after 600 cycles—exceptional for mid-priced cells. The balanced hybrid cathode material (NMC + LCO) explains its stable thermal performance in high-drain scenarios.” — Dr. Elena Voss, Power Systems Engineer
FAQs
- How long does a full charge last?
- Runtime depends on device draw. A 1A device runs ~3.5 hours, while 10A drains it in 20 minutes. Average users get 2-3 days per charge in moderate-use scenarios.
- Are these batteries protected against reverse polarity?
- Yes. A built-up PCB prevents reverse charging and overcurrent. The outer insulation sleeve also minimizes short risks.
- Can I use them in series/parallel configurations?
- For series (higher voltage), use identical batteries with a BMS. Parallel setups (higher capacity) require matching charge levels. Never mix old/new cells.