The DR30 was a type of laptop computer battery used during the 1990's. This 7.2V battery used nickel metal hydride batteries cells, and provided 2800-3200 mAh of power.

This battery fell out of use when lithium ion batteries became popular in the later 90's, dell laptop battery,due to their higher energy density. Duracell stopped producing DR30's in 1996, although generic equivalents can still be purchased today. Fedco Electronics, Inc. manufactures this battery in Wisconsin, under the Part Number DR30AA, and it can be purchased from numerous resellers.
Upgradeability
Upgradeability of laptops is very limited compared to desktops, which are thoroughly standardized. In general, hard drives and memory can be upgraded easily. Optical drives and internal expansion cards may be upgraded if they follow an industry standard,Latitude CPX, Latitude C600, Latitude C610, Latitude C640, 1691P, but all other internal components, including the CPU and graphics, are not intended to be upgradeable.

The reasons for limited upgradeability are both technical and economic. There is no industry-wide standard form factor for laptops; each major laptop manufacturer pursues its own proprietary design and construction, with the result that laptops are difficult to upgrade and have high repair costs. With few exceptions, laptop components can rarely be swapped between laptops of competing manufacturers, or even between laptops from the different product-lines of the same manufacturer.

Some upgrades can be performed by adding external devices, Latitude CPX, either USB or in expansion card format such a PC Card: sound cards, network adapters, hard and optical drives, and numerous other peripherals are available, but these upgrades usually impair the laptop's portability, because they add cables and boxes to the setup and often have to be disconnected and reconnected when the laptop is moved.

Latitude CPX, Latitude C600, Latitude C610, Latitude C640, 1691P,