Lithium Ion Cell 105556 3.7v 4000mAh 14.8wh Rechargeable Lithium Ion Polymer Battery

The differences for lithium polymer battery, li-ion battery, lifepo4 battery:

Safety:

Li-Po:

Safer than liquid Li-ion due to solid/polymer electrolyte (reduced risk of leakage).

Vulnerable to swelling if overcharged; requires protective circuits.

Cylindrical Li-ion:

Liquid electrolyte poses a higher risk of thermal runaway or explosion under abuse (e.g., overheating, short circuits).

Metal casing provides mechanical protection but traps heat.

LiFePO₄:

Best thermal stability (high decomposition temperature, ~510°C vs. ~200°C for NMC).

Lowest risk of fire/explosion; no cobalt/nickel toxicity.

Cycle Life

Li-Po: 300–500 cycles (depends on depth of discharge; shorter with frequent full discharges).

Cylindrical Li-ion: 500–1,000 cycles (longer with NCA/NMC chemistries in EVs).

LiFePO₄: 2,000–5,000+ cycles (longest lifespan, ideal for frequent charging/discharging).

Temperature Performance:

Li-Po: Operates well in moderate temperatures (0–60°C); sensitive to extreme cold/heat.

Cylindrical Li-ion: Similar to Li-Po but slightly better high-temperature tolerance in metal casings.

LiFePO₄: Performs best in wide temperature ranges (−20°C to 60°C), with minimal capacity loss in cold climates.

Weight & Design:

Li-Po: Lightest and most flexible; used in devices requiring custom shapes (wearables, thin gadgets).

Cylindrical Li-ion: Rigid and heavier per capacity; standardized sizes (18650) enable easy integration into large packs (e.g., laptops, EVs).

LiFePO₄: Slightly heavier than Li-Po but lighter than some cylindrical Li-ion in pouch form; less design flexibility than Li-Po.

Cost:

Li-Po: Moderate to high (due to cobalt/nickel content and custom manufacturing).

Cylindrical Li-ion: High for premium cells (e.g., NCA) but cost-effective at scale (common in EVs).

LiFePO₄: Lowest cost (cobalt/nickel-free materials, simpler manufacturing; ideal for large-scale energy storage).

Typical Applications:

Li-Po:

Portable electronics (smartphones, tablets, wearables), drones, RC toys, and thin devices needing flexible power.

Cylindrical Li-ion:

Electric vehicles (Tesla’s 21700 cells), laptops, power tools, and large energy storage systems (due to standardized sizes and high energy density).

LiFePO₄:

Electric buses, e-bikes, solar/wind energy storage, backup power, and applications prioritizing safety and long life (e.g., marine, grid storage).

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