Lithium-Ion Batteries

What are Lithium-Ion Batteries?

Lithium-Ion Batteries are rechargeable cells that store energy through lithium-ion movement between anode and cathode during charge and discharge cycles. They offer high energy density and low self-discharge compared to older battery types. A single 18650 lithium ion cell delivers 3.7V nominal and 2000 to 3500mAh capacity. A common example in Indian college robotics projects is using three 18650 cells in series to build an 11.1V battery pack for powering a robot chassis with gear motors.

Lithium-Ion Batteries Available at StemVolt

• 3.7V 2000mAh 18650 Li-Ion Battery Cell — Standard rechargeable li ion battery cell for flashlights, power banks, and portable robot builds
• 11.1V 2200mAh Li-Ion Battery Pack — Three-cell series pack for powering robots, RC builds, and portable electronic systems
• 3.7V 2600mAh 18650 High Capacity Cell — High capacity rechargeable li ion battery for longer runtime in power bank module builds

• Also explore: Lithium Polymer Batteries
• Also explore: Battery Holders and Accessories
• Also explore: Arduino Compatible Boards
• Also explore: Power and Charging Modules

How to Choose the Right Lithium-Ion Batteries

Choose based on voltage, capacity, and whether you need individual cells or a ready-made pack. For single-cell builds like power banks and small sensors, an 18650 cell at 3.7V is the standard choice. For higher voltage builds needing 7.4V or 11.1V, series packs with built-in BMS protection are safer than building custom packs without protection circuits. Always verify the discharge rate of the cell against your load current. One practical tip: never connect lithium-ion cells in series without a BMS board, as unbalanced cells can overcharge individually and become a fire risk in enclosed project enclosures.