SanDisk Sansa Clip Zip MP3 Player Rechargeable Battery - 3.7V 300mAh - 303038
Built-in protection circuit (PCM) prevents over charging/discharging.
Actual measured dimensions (mm): D3.8 x W30.3 x L36.9
Polarity: Red (+) / Black (-) / White (T)
Shipped fast and secure from the UK (global shipping available).
If you have any questions at all, or if you don't see the battery you require, please ask.