The Satellite 305 uses a lithium-ion replacement battery in the 10.8 V to 14.4 V range, with common part numbers across this line including PA3817U-1BRS, PA3819U-1BRS, and PA5023U-1BRS. The exact pack depends on your specific configuration and year, so capacities can fall anywhere from about 31 Wh to 98 Wh. Check the PA number printed on your original battery, then match it to confirm fit before you order. Prices in this category run from $42.99 to $58.99.

Match the part number printed on your original battery, which follows the format PAxxxxU-1BRS (for example, PA3817U-1BRS or PA5110U-1BRS). That number is the most reliable way to confirm fit across the roughly 3,545 compatible models in this line. If you cannot read the battery label, use your exact laptop model number from the sticker on the bottom of the unit. Also confirm voltage, since this line spans 10.8 V to 14.4 V, and capacities range from about 31 Wh to 98 Wh.

Replacement batteries for this line run from $42.99 to $58.99, depending on cell count and capacity. Lower-capacity 4-cell packs near 31 Wh sit toward the bottom of that range, while higher-capacity packs approaching 98 Wh land at the top. Because there are 63 distinct part numbers across this category, the right price for you depends on matching your exact model and part number, such as PA3819U-1BRS or PA5184U-1BRS.

No, not across the board. With 63 distinct part numbers spanning 10.8 V to 14.4 V and capacities from about 31 Wh to 98 Wh, packs differ in voltage, cell count, and physical shape. A removable pack like the PA3817U-1BRS will not fit a model designed for an internal pack such as the PA5184U-1BRS. Even similar-looking laptops can take different batteries, so always confirm the PA number on your original battery before ordering a replacement.

The main differences are battery type, voltage, and cell count. Earlier models (roughly pre-2013) typically use removable packs that clip underneath, while many later models use internal packs secured by screws behind the back panel. Voltage ranges from 10.8 V to 14.4 V, and packs vary from smaller 4-cell units near 31 Wh up to larger configurations near 98 Wh. Part numbers like PA3817U-1BRS, PA5110U-1BRS, and PA5184U-1BRS each correspond to specific configurations and years.

The part number is printed on a label on the battery itself, in the format PAxxxxU-1BRS (for example, PA5023U-1BRS or PA3817U1BAS). On removable models, slide the pack out from underneath the laptop and read the label. On internal models, the number may also appear in service documentation, since reaching the battery means removing the back panel. You can also use your exact laptop model number from the sticker on the bottom of the unit to confirm the correct pack.

Often yes, but the method depends on your model. Pre-2013 units usually have a removable pack that releases with a latch underneath the laptop, which takes only a minute and no tools. Later models, especially in the R50 era with packs like the PA5184U-1BRS, use an internal battery secured by screws behind the back panel, so you will need a screwdriver and a bit more care. Always confirm whether your unit is removable or internal before starting.

Common signs include much shorter runtime than when the laptop was new, the charge dropping suddenly under load, or the system shutting off unexpectedly even with charge remaining. You may also see the battery stop holding a charge near full capacity, falling well below its rated 31 Wh to 98 Wh. If your laptop only runs while plugged in, that points to an aged pack. Matching the original PA number, such as PA3819U-1BRS, ensures the replacement restores expected voltage and capacity.