Samsung INR21700-40T 4000mAh 35A - New
Samsung INR21700-40T 4000mAh 35A – High-Drain Li-Ion 21700 Battery Cell
The original Samsung INR21700-40T is a premium-quality lithium-ion battery cell designed for applications requiring high power output and exceptional performance. With a capacity of 4000mAh and a maximum continuous discharge current of 35A, it is an excellent choice for power tools, battery packs, industrial devices, and advanced vaping devices.
The 21700 format provides extended runtime and stable performance even under heavy loads. Thanks to its low internal resistance, the Samsung 40T delivers energy efficiently and consistently, making it one of the most popular high-drain cells available on the market.
Important: This battery cell does not include a built-in PCB/PCM protection circuit. Proper battery management systems and Li-Ion compatible chargers are recommended for safe operation.
The discharge current when working in packs (a battery composed of many 18650 or 21700 cells) is lower than the current specified in the catalog note for one cell. This is due to the fact that many cells in the pack heat up from each other. The increased and uneven temperature of the pack causes rapid degradation of the cell and such a battery may not survive even one season. For the safety and long life of your battery, always design it safely based on the maximum operating current in the pack. Do not overload the cells, do not build a pack based on the maximum current for 1 cell - otherwise your pack will have a very short lifespan.
The stated internal resistance of the cell is based on the manufacturer’s official datasheet. This value is declared by the manufacturer and may differ from the result obtained when measuring an individual cell.