Samsung 40T 21700 4000mAh 35A Battery
The Samsung 40T 4000mAh Battery is the top tier battery and a great upgrade for any 21700 flashlight. It's always great to have a backup ready too.
- Flashlight not included -
Here are GENUINE Samsung 40T cells
Samsung 40T 21700 cells are 4000mah capacity when new and these test consistently slightly above that rating which is why some are labelled 4000mah and others are labelled 4000mah. They are all the same cells. Since these are EV cells they are perfect for any application like flashlights, DIY powerwalls, EV conversions, mobile solar generators, etc.
Specifications:
| Manufacturer | Samsung SDI |
| Model | 40T (3) |
| Size | 21700 |
| Positive Terminal |
Flat Top |
| Nominal Capacity | 4000mAh |
| Continuous Discharge Rating (max) | 35A |
| Nominal Voltage | 3.6V |
| Maximum Voltage | 4.2V |
| Discharge cut-off Voltage | 2.5V |
| Protected | No |
| Rechargeable | Yes |
| Approx. Dimensions | 21.1mm x 70.4mm |
| Approx. Weight | 68.2g |
| Country of Origin | Republic of Korea |
| Associated Names | INR21700-40T |
| Data Specification Sheet | Samsung 40T (3) Datasheet |
I bought these 5000 mah batteries as a 25% upgrade to the 4000 mah batteries that came with the Reylight Quad Emitter flashlight. More power and the same weight. Makes a great flashlight even better.
Haven’t used these yet to their fullest extent but they do work in my Reylight Quad Emitter Dawn Custom Maratac™ LED Flashlight + Glow Afterburner ( Gen 2 ). However you cannot use the Magnetic Bi-Direct Smart Battery Charger to charge them. Only works with the Pro Intelligent Battery Charger.
