The Satellite 305 uses a lithium-ion battery from the PA3534U-1BRS and PA3535U-1BRS family, rated in the 10.8 to 14.4 V range. It is offered in a 6-cell standard capacity or a 9-cell extended capacity for longer runtime. Because this model shares chassis designs across the late Satellite A era, always confirm the part number printed on your original pack before ordering. Replacement prices in this category run from $56.99 to $69.99.

Match your exact model number to the part number on your original battery. Flip the laptop over, read the full model on the bottom label, then remove the existing battery and check the PA-series part number printed on it, such as PA3817U-1BRS or PA5110U-1BRS. The Satellite A range covers about 3,545 models with 63 distinct part numbers, so using both the model and the printed part number is the most reliable way to get a battery that fits the connector and chassis.

Replacement batteries in this category cost between $56.99 and $69.99. The price depends on the cell count and capacity, with 6-cell standard packs at the lower end and 9-cell or 12-cell extended packs toward the higher end. Capacities run from about 31 to 98 Wh. To match the right price and fit, confirm your part number, for example PA5184U-1BRS or PA3819U-1BRS, against the label on your current battery.

Not across the whole series. The Satellite A range spans early, mid, and late generations with different chassis shapes and connector layouts, so a battery for one model often will not fit another. For example, an early A20 family pack does not work in a late A305. Batteries are generally interchangeable only within the same part number family, such as the PA3534U-1BRS and PA3535U-1BRS group. Always confirm the PA-series number on your original pack before ordering.

Cell count, capacity, and physical fit differ across generations. Early desktop-replacement models used heavier packs to power high-heat processors, mid-era Core 2 Duo models moved to slimmer batteries integrated into the rear spine, and late multimedia models used high-capacity packs to drive dedicated graphics. Capacities span about 31 to 98 Wh across 6-cell, 9-cell, and 12-cell builds, with voltages from 10.8 to 14.4 V. Part numbers like PA3817U-1BRS and PA5110U-1BRS reflect these different generations.

The part number is printed directly on the original battery. Power down, remove the battery from the rear of the chassis, and read the label for a PA-series code such as PA5023U-1BRS or PA3817U1BAS. Many models also list compatible numbers or a PABAS code on the same label. If the battery is integrated into the rear spine, you can often find the model number on the bottom case label and cross-reference it to confirm the correct part.

Yes, on most models it is a straightforward swap. Mid and late Satellite A batteries sit in the rear spine of the laptop, so you power down, release the latch, slide the old pack out, and seat the new one until it clicks. No tools are usually required for these removable packs. Confirm your part number, such as PA3819U-1BRS, matches before installing. Charge the new battery fully on first use to help the laptop read its capacity correctly.

Common signs include sharply reduced runtime, the laptop shutting off unexpectedly when unplugged, and the charge sitting at a fixed percentage that will not climb. You may also see the operating system report the battery as needing replacement, or the pack failing to charge past a low level. If a 9-cell extended pack that once delivered hours now lasts minutes, it is time for a new one. Match the printed part number, like PA5184U-1BRS, when you order a replacement.