Tenergy Lithium Ion D Batteries T9688 are rechargeable D-cell batteries designed for high-drain devices. They offer 10,000mAh capacity, 1,000+ recharge cycles, and a stable 1.5V output. Ideal for solar lights, medical devices, and high-power toys, they outperform alkaline batteries in longevity and cost-effectiveness while reducing environmental waste. Compatible with standard NiMH chargers.
How to Prevent Lithium-Ion Battery Fires and Explosions
What Are the Key Features of Tenergy T9688 Batteries?
The Tenergy T9688 delivers 10,000mAh capacity with lithium-ion technology, maintaining 1.5V until depletion. Built-in microchips prevent overcharging/overheating. They retain 85% charge after 1 year of storage and work in temperatures from -20°C to 60°C. Unlike NiMH batteries, they eliminate voltage drop issues in sensitive devices like digital cameras.
How Do They Compare to Alkaline and NiMH Alternatives?
Compared to alkaline batteries, Tenergy T9688 lasts 3x longer per charge cycle. Against NiMH batteries, it holds voltage stability 58% better under heavy loads. A cost analysis shows 72% savings over 3 years compared to disposable alkalines. However, they weigh 15% more than standard NiMH D-cells (160g vs 140g).
Recent field tests demonstrate superior performance in extreme conditions. When powering GPS tracking units at -15°C, T9688 batteries provided 94% of their rated capacity versus 62% for NiMH alternatives. The lithium-ion chemistry also enables faster recharge times – reaching 80% capacity in just 3 hours compared to 5.5 hours for equivalent NiMH models. For users requiring consistent power delivery in tools like portable spotlights, the T9688 maintains brightness levels 22% longer during continuous use.
| Battery Type | Cycle Life | Weight | Cold Weather Performance |
|---|---|---|---|
| Tenergy T9688 | 1,000+ | 160g | 94% capacity at -15°C |
| Standard NiMH | 500 | 140g | 62% capacity at -15°C |
Which Devices Are Most Compatible With These Batteries?
Optimal for devices drawing 2-3A continuously: camping lanterns (tested 48h runtime), baby monitors (21-day operation), and professional microphones. Avoid in low-drain smoke detectors – the constant 1.5V output may trigger false “weak battery” alerts. Works with 92% of solar garden lights according to 2023 compatibility surveys.
Why Choose Lithium-Ion Over Traditional Battery Chemistries?
Lithium-ion provides 40% higher energy density than NiMH. Laboratory tests show 0% voltage sag under 3A load versus 22% sag in NiMH. The T9688’s 1,000-cycle lifespan equals 5-7 years of daily use. Environmental impact analysis reveals 62% lower carbon footprint than disposables when charged via solar energy.
How Does Charging Efficiency Impact Real-World Use?
The T9688 charges fully in 4.5 hours using 2A chargers, achieving 98% charge efficiency. Partial charging (50% refills) extends cycle life to 1,200+. Field tests show 13% faster device startup compared to NiMH due to stable voltage. Includes reverse polarity protection but requires occasional full discharge cycles to maintain capacity.
What Safety Mechanisms Prevent Overheating Issues?
Triple-layer protection includes: 1) Current-limiting IC (max 4A draw), 2) Thermal cutoff at 70°C, and 3) Pressure relief vents. Third-party testing recorded 0 thermal events in 1,200 abuse tests. The UL2054-certified cells use flame-retardant separators and automatic shutdown during short circuits.
The multi-stage protection system actively monitors three key parameters: temperature rise rate, voltage differentials, and internal pressure changes. During simulated short-circuit tests, the current-limiting circuit engaged within 0.8 milliseconds – 3x faster than industry requirements. The pressure relief system activates at 15psi to safely vent gases while maintaining cell integrity. These features make the T9688 suitable for use in pediatric medical devices where absolute reliability is critical.
| Safety Feature | Activation Threshold | Response Time |
|---|---|---|
| Overcurrent | 4.1A | 0.8ms |
| Overheat | 70°C | 2.5s |
| Overpressure | 15psi | 3.2s |
“Tenergy’s voltage regulation tech bridges the gap between lithium-ion’s raw power and device compatibility needs. Our lab measured 1.49-1.51V output variance under load – unprecedented stability for rechargeable D-cells. These batteries enable new applications in portable robotics that previously required bulky LiPo packs.”
– Dr. Elena Voss, Power Systems Engineer at TechEnergy Labs
FAQ
- Can I Use These in Series Configurations?
- Yes – the built-in balancing circuit allows up to 4 cells in series (6V total). Exceeding this may trigger overvoltage protection. Parallel configurations are not recommended due to potential current backflow.
- Do They Work With Smart Chargers?
- Compatible with any NiMH charger, but optimal charging requires 1.48V termination voltage. Advanced chargers with Li-ion modes increase efficiency by 11%. Avoid trickle charging – the batteries enter sleep mode below 5% charge.
- How to Store for Maximum Lifespan?
- Store at 40% charge in 15-25°C environments. Capacity loss is 0.3%/month vs 3% for NiMH. For seasonal devices, perform full discharge/charge cycles every 6 months to recalibrate the fuel gauge IC.