NinjaBatt Pro HS04 Rechargeable Battery. Says 2600mAh. Battery has the following on it M5Y1K 3451. Box or packaging, if any, may have wear and tear or stickers - see pictures. I put used for the following reasons - I get these either from estate sales or from a stores warehouse that has items that have been opened by customers in the store and not purchased or returned and sometimes not even used - but the store still can no longer sell them at their main store. May have wear/marks/scuffs/scratches/box rips/etc. since it may have been used. Since this is a general listing for the many items I've purchased please ask questions as needed and I can share more specifics. Comes only with what is shown related to the item. Sold in the condition shown and described. Please view all pictures from many various angles carefully and ask questions as needed. Thank you.