How long is the service life of a cordless table lamp?

The operational lifespan of a cordless table lamp generally spans 3 to 10 years, largely influenced by battery chemistry, LED specifications, structural integrity, and usage behaviours.

• Battery Type & Cycle Life:
  Lithium-ion (Li-ion) batteries offer ~300–500 charge cycles, equating to 2–3 years of typical use. Lithium iron phosphate (LiFePO₄) batteries, with 2,000–3,000 cycles, support a longer functional life of 5–10 years. Lower-grade chemistries (e.g., NiMH or alkaline) degrade faster and may not be rechargeable.

• LED Lifespan:
  Most units incorporate LEDs rated for 15,000–50,000 operational hours. With average daily use (2–4 hours), this enables potential LED longevity exceeding a decade. Thermal management and LED bin quality critically impact lifespan.

• Construction Quality:
  Inferior soldering, lightweight plastic enclosures, and unshielded circuitry in low-cost models often lead to premature failure. Devices using aluminium alloy or high-grade thermoplastics demonstrate superior mechanical resilience.

• Charging Behaviour:
  Persistent overcharging or deep cycling (0–100%) degrades battery health. Optimal battery longevity is maintained by charging within the 20%–80% state-of-charge (SoC) range and avoiding continuous trickle charging.

• Usage Profile:
  Operating at maximum brightness consistently accelerates battery degradation. Intermittent or low-brightness usage reduces thermal and electrical stress, extending overall system longevity.