Short answer: Most power banks use lithium-ion cells rated for about 300 to 500 full charge cycles before capacity falls to roughly 80% of new. For typical use that works out to around 2 to 3 years. It does not stop working on a fixed date. It slowly holds less.
What a "cycle" means
One cycle is one full battery's worth of charge and discharge. Using half the battery twice counts as roughly one cycle. There is no single industry standard for counting cycles, so treat the numbers below as estimates, not promises.
How long it lasts, by how you use it
The table assumes 300 to 500 cycles to reach about 80% capacity.
| How often you drain and recharge it fully | Cycles per year | Time to reach about 80% capacity |
|---|---|---|
| Every day | about 365 | about 10 to 16 months |
| 3 times a week | about 156 | about 2 to 3 years |
| Once a week | about 52 | 5 years or more on paper, but age and heat shorten this |
Age matters even when you do not use it. Heat and storing it full both reduce capacity over time.
What shortens a power bank's life
- Heat. Battery University reports that a fully charged lithium-ion battery kept at 40°C loses about 35% of its capacity in a year, even unused. Do not leave it in a parked car or in direct sun.
- Sitting full for long periods. Keeping lithium-ion at a high charge level affects its life more than normal day-to-day use does.
- Constant full drains. Shallow cycles are gentler than 0 to 100% cycles.
- High current and poor chargers. Elevated temperature and high currents reduce cycle life.
- Low-quality cells. Cheap, unbranded cells degrade faster.
5 signs it is time to replace it
- It holds noticeably less. It charges your phone fewer times than when it was new.
- It gets very hot during normal use or charging.
- It shuts off suddenly even though it shows charge left.
- It takes much longer to recharge than before.
- The case is swollen or bulging. Stop using it at once.
If it is swollen
Do not charge it, press it or puncture it. Keep it away from heat and flammable items, and hand it to an authorised e-waste collection point or recycler. Do not throw it in household waste.
How to make it last longer
- Charge it before it reaches 0% when you can.
- Store it at about half charge, in a cool dry place, if you will not use it for weeks. Battery University suggests 40 to 50% for long storage.
- Keep it out of hot cars and direct sun.
- Use a good-quality cable and charger.
Warranty on alain power banks
alain power banks carry a warranty against manufacturing defects: 1 year on PowerFlex, Prime, Air Mag, Magon, SolRover, TravelMate and LumoPower, and 6 months on Pocket Charge, Pocket Charge Pro and LuxSlim. See each product page for terms.
Frequently asked questions
How many years does a power bank last?
Typically 2 to 3 years of regular use, or about 300 to 500 full cycles to reach around 80% of its original capacity.
Can a power bank last more than 5 years?
It can still work, but it will usually hold much less and be less reliable. Replace it if it shows any warning sign.
Is it safe to use an old power bank?
It is generally fine if it charges normally, does not overheat and is not swollen. Stop using it if any of those change.
Does leaving a power bank plugged in damage it?
Heat and long periods at full charge shorten battery life. Unplug it once it is full, and do not leave it charging on a bed or in the sun.
How should I store a power bank?
In a cool, dry place at about half charge, and check it every few months.
Does fast charging shorten battery life?
High currents and heat can reduce cycle life. Using a quality charger and keeping the power bank cool matters more than avoiding fast charging altogether.
Related reading
- Best power bank for travel in India
- Can you carry a power bank on a flight?
- Best power banks under ₹2000
- The alain power bank range
Last reviewed: 5 October 2026.