Are ThinkPad and IdeaPad batteries interchangeable?
No. ThinkPad and IdeaPad use different battery part numbers and connectors. Always match the exact Lenovo part number for your model.
Lenovo spreads battery part numbers across IdeaPad, ThinkPad and Yoga families, and ThinkPad models in particular use many different codes. Match the Lenovo part number (for example L17L3PB0 or similar) and the voltage from your old battery.
Listings show voltage and capacity so you can confirm the fit. Send the Lenovo part number or model if you want us to verify before packing.

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No. ThinkPad and IdeaPad use different battery part numbers and connectors. Always match the exact Lenovo part number for your model.
Many IdeaPad and ThinkPad models have internal batteries that need the back cover removed. If you are comfortable opening the base and disconnecting the battery connector, replacement is straightforward; otherwise a technician can fit it.
Flip the laptop over or remove the old battery and read the part number and voltage printed on it (for example, a code like “HSTNN-LB7J” with “11.55V 41Wh”). Match that part number, voltage and capacity to the listing. The laptop model number on the bottom sticker also helps narrow it down.
An original (OEM) battery is made or branded by the laptop manufacturer. A compatible battery is built to the same voltage, capacity, connector and shape and works the same way, usually at a lower price. Both are fine as long as the voltage and part number match your laptop.
No. A higher-capacity battery at the same voltage simply lasts longer per charge. What you must never change is the voltage. A different voltage can fail to charge or harm the laptop.
Yes. Replacement batteries carry a replacement warranty (commonly 6 months); the exact term is shown on each product page along with the DOA (dead-on-arrival) support window.