The Differences Between Lithium-Ion and Polymer Batteries

Lithium-ion technology is popular in modern batteries thanks to faster charging times and higher power density. Lithium-ion and lithium polymer batteries are two common types of batteries that use lithium-ion technology. Learn the differences between lithium-ion and polymer batteries to understand how each option performs.


The battery electrolyte is a solution that facilitates the transfer of ions between the battery’s electrodes. The ions are charge-carrying particles, and their movement causes the battery to charge and discharge.

Lithium-ion batteries use a liquid electrolyte, usually lithium salts dissolved in an organic solvent. In contrast, lithium polymer batteries use a gel-like solid electrolyte typically composed of lithium salts, polymers, and organic solvents.

Energy Density

Another critical difference between lithium-ion and polymer batteries is their energy density levels. Energy density is the amount of energy that the battery can store per unit volume.

Lithium-ion batteries typically have higher energy density than polymer batteries. The liquid electrolyte allows for better ion conductivity, making lithium ions more mobile between the electrodes. The increased movement improves the battery’s capacity at higher discharge rates.

Cost and Manufacturing

Lithium-ion batteries are more established in the market, streamlining the manufacturing process and making them more cost-effective. Lithium-ion battery materials, including liquid electrolyte, have been mass-produced for years.

In contrast, polymer batteries are a newer product with slightly higher production costs. As manufacturing processes develop, polymer batteries may become more cost-effective over time.

Shop for Lithium-Ion Forklift Batteries

Lithium-ion batteries have a liquid electrolyte, whereas polymer batteries have a solid gel electrolyte. This primary difference explains why lithium-ion batteries have a greater energy density. Finally, lithium-ion batteries are more affordable than polymer batteries because they are an established product.

At Green Power Forklift Batteries, we carry high-quality lead-acid and lithium-ion forklift batteries. Browse our wide selection of rebuilt forklift batteries, or use our battery selector to find the battery that best suits your needs.