Lenovo 121500237, L12S4E21, 4INR19/66, 35008674. Lenovo 121500237. Lenovo L12S4E21. 100% compatible with Lenovo batteries - Fully compatible with Lenovo IdeaPad P400 Touch Ideapad P500 Touch IdeaPad Z500 IdeaPad Z510 IdeaPad Z400 IdeaPad P500.
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