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3.7V, Li-ion, 5000mAh, Speaker battery fits Yoto, INR21700, YP004, player 3rd Gen, 18.5Wh RBC18 These are rechargeable AGM sealedCameron Sino CS YPY004SL Replacement Battery for Yoto Speaker 5000mAh 18. 5Wh Restore your devices performance with the Cameron Sino CS YPY004SL replacement battery, purpose built for Yoto speakers. This high capacity 5000mAh Li ion battery delivers stable 3. 7V output and long lasting power, ensuring your device runs smoothly through extended use. 5000mAh Capacity 3. 7V Output 18. 5Wh Rechargeable Li ion Technical Specifications ModelCS YPY004SL