The Tenergy Lithium 9V Rechargeable Battery 10 Pack offers high energy density, 1200mAh capacity, and 1000+ charge cycles. These lithium-ion batteries maintain stable voltage for smoke detectors, musical instruments, and pro audio gear. With no memory effect and USB-C charging compatibility, they reduce waste and provide long-term cost savings compared to disposable alkaline batteries.
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What Safety Features Do These Batteries Include?
Tenergy’s batteries feature built-in PCB protection against overcharge (4.35V cutoff), over-discharge (2.4V cutoff), and short circuits. Flame-retardant casing and thermal fuses prevent thermal runaway. Unlike LiPo batteries, these use stable lithium iron phosphate (LiFePO4) chemistry with UL certification, meeting UN38.3 transportation safety standards for air travel.
Advanced safety mechanisms include three-stage voltage monitoring and pressure relief vents. The batteries automatically enter sleep mode when stored for 90+ days to prevent deep discharge. Each unit undergoes rigorous drop testing from 1.5 meters onto concrete surfaces, exceeding IEC 62133-2 safety requirements. The casing maintains integrity at altitudes up to 15,000 feet, making them suitable for aviation equipment and high-altitude weather stations.
| Safety Feature | Specification |
|---|---|
| Overcharge Protection | 4.35V ±0.05V cutoff |
| Temperature Range | -30°C to 60°C operation |
| Short Circuit Response | 0.3ms disconnect |
How Long Does Charging Take with the Included Adapter?
The USB-C charger delivers 2A current, achieving full charge in 2.5 hours. Smart IC automatically switches to trickle charge at 90% capacity. Compatible with PD 3.0 chargers (up to 20V input). Each charge provides 8-12 weeks standby power for smoke detectors or 15+ hours continuous use in wireless audio gear.
Charging efficiency remains consistent across 500 cycles, with only 8% capacity degradation. The adaptive charging system monitors battery temperature through four contact points, adjusting current flow to maintain optimal 104°F (40°C) during rapid charging. For partial charges, 30 minutes provides enough power for 6 hours of continuous use in guitar effects pedals. The included adapter supports simultaneous charging of four batteries without voltage drop, using independent charging circuits for each bay.
| Charge Phase | Time | Capacity Added |
|---|---|---|
| Constant Current | 0-100 mins | 0-90% |
| Trickle Charge | 100-150 mins | 90-100% |
“Tenergy’s LiFePO4 9V batteries represent a paradigm shift in rechargeable power. Their 1,200-cycle lifespan outperforms industry averages by 40%, and the flat discharge curve ensures consistent device performance. For professional audio engineers and safety system installers, this 10-pack offers both reliability and dramatic cost savings over time.”
— James Carter, Power Systems Analyst at BatteryTech Insights
FAQs
- Can I Use These Batteries in Smoke Detectors?
- Yes, they’re specifically recommended for smoke detectors with 10-year sealed units. The stable voltage ensures reliable operation, and low self-discharge maintains charge during extended standby periods.
- Do They Come Pre-Charged?
- Batteries ship at 40% charge (storage charge). Full initialization requires 2.5-hour charge before first use. Includes charge level indicator on each battery.
- What Warranty is Provided?
- Tenergy offers 5-year limited warranty covering manufacturing defects. Covers capacity below 80% after 500 cycles with proper use. Proof of purchase required for claims.