Samsung INR18650-29E7 - The endurance specialist (2900 mAh)

The Samsung INR18650-29E7 (version 7 of the popular 29E series) is a lithium-ion cell that is specially designed for Longevity and Endurance was developed. In contrast to the "sprinter" Samsung 25R, this battery is a "marathon runner". With a capacity of 2900 mAh and a very high cycle stability, it is the industry standard for e-bike batteries, pedelecs and large energy storage devices (powerwalls). The "E7" version is the latest iteration of this cell and offers an even more stable voltage curve than its predecessor (E6).

Highlights at a glance

• Focus on service life: This cell is optimised to be charged and discharged over many years. It can withstand many charging cycles (often over 500-1000 with gentle use) before the capacity noticeably decreases.
• Ideal capacity: With 2900 mAh offers around 15-20% more runtime than the standard 2500 mAh cells, without being as sensitive or expensive as the absolute high-end cells (3500 mAh). It hits the "sweet spot" of price and performance.
• Medium current output (middle drain): It delivers up to 8.25 amps (approx. 3C). This is perfect for e-bikes (where many cells are connected in parallel) or normal torches, but not enough for high-performance vaping or extreme tools.
• Safe INR chemistry: Uses lithium nickel manganese cobalt oxide. This chemistry is considered very safe and thermally stable.
• E-bike standard: If you were to open a high-quality battery for your Bosch, Yamaha or DIY e-bike, you would most likely find exactly this type of cell in it.

The centrepiece for e-mobility

The Samsung 29E7 is often underestimated because it does not deliver extreme amperage figures. But in a battery pack (e.g. 4 cells in parallel), the current adds up to over 30 amps, which is enough for almost any electric motor. Its strength is the UniformityThe cells hardly drift apart (balancing) and keep the voltage stable for a very long time.
 

Features

FAQs about the Samsung INR18650-29E7

What does "E7" mean? 

This is the revision number. There used to be the 29E (version 6). The Version 7 (E7) is the improved new edition. It has a slightly more linear discharge curve, which makes it easier for the battery display on the e-bike to calculate the exact charge level ("remaining range").

Can I use it to repair my cordless screwdriver? 

Conditional. For small screwdrivers (Ikea, Bosch IXO) yes. For large professional machines (Makita 18V, Hilti) that drive thick screws into wood, this cell is not suitable. too weak (only 8A). It would overheat here. It is better to use the Samsung 25R (20A).

Is it suitable for vapers (e-cigarettes)? 

Only for "back-end vapers" (MTL) at low wattages (up to approx. 20-25 watts per battery). The current flow is not sufficient for sub-ohm or high wattages.

Why do some data sheets only state 2750 mAh? 

This is the Guaranteed minimum capacity with a discharge up to 2.5V. In normal use (typical), however, fresh cells reach the advertised ~2850-2900 mAh.

Can I mix these cells (e.g. with 29E6)?

In a series connection (battery pack) you should use the avoid. Always use cells of the same charge and version, as slight differences in internal resistance will otherwise result in the pack becoming unbalanced and ageing more quickly.