The Satellite 305 uses a lithium-ion battery, with common matching part numbers including PA5023U-1BRS, PA3819U-1BRS, and PA3817U-1BRS. Voltage falls in the 10.8 to 14.4 V range and capacity runs from about 31 to 98 Wh depending on whether you have a 4-cell or 6-cell pack. Because the C series used several incompatible types across model years, check the part number printed on your current battery and match it exactly rather than buying by model name alone.

Match the part number printed on your existing battery, then confirm against your exact model number found on the laptop underside. The C series spans about 3,545 compatible models and 63 distinct part numbers, so the model name alone is not enough. Common numbers include PA3817U-1BRS, PA5023U-1BRS, and PA5110U-1BRS. Flip the laptop over, remove or read the battery label, and look for a code beginning with PA. That code is the most reliable way to confirm a correct fit.

Replacement batteries for the Satellite C series run from $48.99 to $58.99. Where your pack lands in that range depends on the part number, cell count, and capacity, since these batteries span 4-cell and 6-cell configurations and roughly 31 to 98 Wh. A higher-capacity 6-cell pack such as a PA5184U-1BRS sits toward the upper end, while smaller-capacity packs cost less. Confirming your exact part number before ordering ensures you pay for the pack that actually fits your machine.

No, Satellite C batteries are not universally interchangeable. The series used several incompatible types across its 2010 to 2016 run, with 63 distinct part numbers covering the lineup. For example, a PA3817U-1BRS from an earlier C-series model will not match a later PA5184U-1BRS pack, even though both laptops carry the Satellite C name. Voltage ranges from 10.8 to 14.4 V and cell counts differ too. Always match the exact part number on your current battery before buying.

The main differences are voltage, capacity, cell count, and connector layout, all reflected in the part number. Across the line, voltage ranges from 10.8 to 14.4 V and capacity from about 31 to 98 Wh in 4-cell and 6-cell builds. Earlier models often use packs like PA3817U-1BRS, while later revisions use numbers such as PA5110U-1BRS or PA5184U-1BRS. Because these are physically and electrically distinct, the part number is the only dependable way to tell which battery your specific machine needs.

The part number is printed on a label on the battery itself, typically beginning with PA, such as PA3817U-1BRS or PA5023U-1BRS. On models with a removable battery, turn the laptop over, release the latch, slide the pack out, and read the label. On units with an internal battery, the code may appear on a sticker on the laptop underside instead. Use that PA code to match one of the 63 part numbers in this category rather than relying on the model name.

Yes, most Satellite C models use a user-removable battery, so replacement is straightforward. Power down, unplug the adapter, flip the laptop over, slide the latch, and lift out the old pack, then seat the new one until it clicks. Confirm the new battery shares the same part number, for example PA3817U-1BRS or PA5184U-1BRS, so the fit and the 10.8 to 14.4 V rating match. Some later, higher-end revisions used internal batteries, which require opening the bottom panel.

Watch for sharply reduced runtime, the laptop shutting off when unplugged, the pack no longer charging to full, or the system staying powered only while connected to the adapter. If a once full day of use drops to under an hour, the cells are worn. These lithium-ion packs (10.8 to 14.4 V, about 31 to 98 Wh) lose capacity over years of charge cycles. When runtime falls well below normal, match your part number, such as PA5023U-1BRS, and install a fresh battery.