Panasonic HHR-1SRE/2B Ready to Use 2800mAh D Batteries Panasonic Always Ready Rechargeable Product Benefits: Ready to use: you can use them immediately after buying them. Stay charged: after 1 year still up to 80% of the capacity remains without charging. Combines the convenience of a disposable battery with the performance and cost benefits of a rechargeable battery. Offers consumers a convenient battery range to meet all their needs. Ideal for the frequent rechargeable battery user.