PA3817U-1BRS PA3819U-1BRS 10.8V 48Wh 6-Cell Replacement Battery for Toshiba Satellite C655 L750 L755 A660 A665 Series

Q1: What is the difference between PA3817U-1BRS, PA3818U-1BRS, and PA3819U-1BRS?
A: Physically and electrically, all three are the same battery. The part number differences reflect Toshiba’s internal regional sourcing codes across different OEM production batches. PABAS227, PABAS228, PABAS229, and PABAS230 are the PABAS-series equivalents for the same footprint. All are drop-in interchangeable — ordering any one of these P/Ns for a machine that shipped with any other works without issue.

Q2: My original battery label shows 11.1V, but this is listed as 10.8V. Is that a compatibility problem?
A: No. Both voltages describe the same 6-cell series Li-ion architecture — 10.8V is the rated voltage per Toshiba’s design specification, 11.1V is the nominal average open-circuit voltage printed on some regional OEM label batches. The battery management system on every compatible Satellite, Satellite Pro, and Portege model in the compatibility list accepts both values without triggering a charge error or capacity warning.

Q3: Does this battery cover the Toshiba Portege M800/M900 and Equium U400? Those aren’t listed on most competitor pages.
A: Yes — confirmed across multiple independent sources including ONEbattery UK, Phinko Technology AU, Lanka Laptop House, and PTComputers AU. The Portege M800/M900 and Equium U400-124/U400-145/U400-146 all use the same 6-cell external bay and connector as the Satellite C/L-series mainline. IT buyers managing mixed Portege and Equium enterprise fleets alongside Satellite consumer units can consolidate under this single SKU.

Q4: I see listings for this battery at 48Wh, 72Wh, and 95Wh. Which one fits the original chassis without modification?
A: The standard 6-cell 48Wh unit (this listing) fits flush within the original chassis bay with no protrusion — it is the OEM-equivalent form factor. The 9-cell 72Wh and 12-cell 95Wh are extended-capacity variants that protrude from the base of the laptop. Those are different physical products; they fit the same connector but change the chassis profile. For fleet standardization and OEM-equivalent replacement, the 6-cell is the correct choice. Extended variants are available on request for specific high-runtime use cases.

Q5: Can this battery cover our entire mixed Toshiba fleet under a single purchase order?
A: It covers a very wide range — over 100 confirmed models across Satellite A, C, L, M, P, T, and U series; Satellite Pro C640/C650/L510/L630/L640/L670; Portege M800/M900/T130/T131; Equium U400; and multiple Dynabook CX/EX/MX/T/Qosmio/B series. The main exclusions are the Satellite C55-B generation (uses PA5185U-1BRS, internal battery) and the Portege Z-series ultrabooks (PA5013U-1BRS). If your fleet mixes these generations, contact us with your device list and we can confirm which SKU covers which machine.

Q6: What is the realistic runtime after replacement on a Toshiba Satellite L755 or C655?
A: Under standard workloads — Office applications, web browsing, Wi-Fi active, display at 50–60% brightness — a fresh 48Wh cell in a Satellite L755 or C655 delivers approximately 2.5–3.5 hours. These platforms run Intel 2nd-gen Sandy Bridge or AMD Brazos processors at 35–45W TDP. Setting a 2.5–3 hour benchmark is the appropriate expectation for customer-facing service documentation on this hardware generation.