Level A1 – BeginnerCEFR A1
2 min
71 words
- Researchers found why batteries lose power.
- Rechargeable batteries expand and contract during use.
- Scientists compare this motion to breathing.
- Tiny shape changes create stress inside batteries.
- Some parts move more than others.
- This uneven motion creates local stress and tiny cracks.
- Over time these cracks reduce battery life.
- Scientists saw these changes with special X-rays.
- Knowing this can help design stronger batteries.
- Better design can make batteries last much longer.
Difficult words
- researcher — person who studies and finds new factsResearchers
- battery — device that stores and gives electrical powerbatteries
- rechargeable — can be charged and used again
- expand — become larger in size or volume
- stress — force or pressure inside a material
- crack — small lines where something breakscracks
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Discussion questions
- Do you use rechargeable batteries at home?
- Have you ever seen a battery change shape?
- Do you try to make batteries last longer?
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