Streamlight is not though of too highly here on the forums. That's not to say they are bad. I would be concerned about using lit ions in the light. At 4.2x 2 you will over volt the light. With one battery it might not power the light.
These have a top voltage of 4.2 and a operation voltage of 3.7 I'm getting a digital charger I can watch the voltage and cut it off. This is the specs.
High discharge rate performance; No memory effects; Provides excellent continuous power sources to your device
Application
Application Flashlights, LED torch, Digital Camera Battery, Electronic cigarette and various household electronic products
12-month Warranty
What You Get: Foxnovo® 16340 Rechargeable Li-ion Batteries, our fan-favorite 12-month warranty and friendly customer service.
Specifications
- Brand: Foxnovo.
- Color: as shown in the pictures.
- Material: Lithium Ion
- Battery Type: 16340 Rechargeable Li-ion Battery.
- Battery capacity: 650mAh
- Rated voltage: 3.7V.
- Power: 2.4Wh.
- Full voltage: 4.2V.
- Cutoff discharge: 2.75V.
- Charge Time: About 1~2 hours
- Rechargeable Times: Over 1000
- Product Certification: CE RL MSDS