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New 8878 Rechargeable Lithium battery Multi Power Functions Tool PF Model Sets Building Blocks Compatible with Lego Parts MOC| | - AliExpress
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BrickLink - Set 8878-1 : LEGO Power Functions Rechargeable Battery Box [Power Functions] - BrickLink Reference Catalog
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electronics - Can I use a generic (non-Lego) transformer with a rechargable Power Functions battery? - Bricks
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LEGO 8878 Power Functions Rechargeable Battery Box Set Parts Inventory and Instructions - LEGO Reference Guide
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