PA5109U-1BRS 10.8V 48Wh Replacement Battery for Toshiba Satellite C55 C850 C855 C875 Series

Q1: Are PA5109U-1BRS, PA5108U-1BRS, and PA5110U-1BRS interchangeable?

Yes. All three part numbers — PA5108U-1BRS, PA5109U-1BRS, and PA5110U-1BRS — share identical physical specs: same voltage (10.8V), same capacity (48Wh), same housing dimensions, and same connector. PABAS271, PABAS272, and PABAS273 are the alternate P/N designations for the same unit. They are fully cross-compatible. One critical check before ordering: confirm your original battery is rated 10.8V or 11.1V. If it reads 14.4V or 14.8V, that is a different cell platform entirely and cannot be substituted.

Q2: Why do some listings show 10.8V and others show 11.1V for the same battery?

Both labels refer to the same physical battery. The difference is a manufacturer convention, not an electrical one. Li-ion cells are rated at either 3.6V or 3.7V per cell depending on the standard used. Three cells in series gives either 10.8V or 11.1V — the discharge curve is identical. You can safely replace a 10.8V battery with an 11.1V labeled unit of the same model, and vice versa. Note that 10.8V equals 11.1V, and 14.4V equals 14.8V — but other voltage differences are not compatible.

Q3: Does the PA5109U-1BRS need activation or conditioning when first received?

No special activation is required. New batteries ship at approximately 30–50% charge as a storage precaution. Recommended first-use procedure: charge to 100% before first use, then run through 3–4 full charge/discharge cycles (charge to full, discharge to ~5%, do not force to 0%). This initializes the BMS capacity tracking. For IT teams doing bulk deployments, completing this step centrally before device handoff prevents end-user complaints about short runtime on “new” batteries.

Q4: How long will the PA5109U-1BRS last in normal use, and how many charge cycles can I expect?

Under standard office workload (60% screen brightness, mixed document and browser use), the 48Wh capacity delivers roughly 3–4 hours of runtime. Under heavier load (video, multitasking), expect 1.5–2 hours. The battery is rated for over 500 charge and discharge cycles, which translates to approximately 1.5+ years of daily use before noticeable capacity degradation. For repair centers quoting replacement warranties to end customers, that 500-cycle figure is the defensible technical baseline.

Q5: Do you support sample testing before a bulk order? What are the MOQ and pricing terms?

Yes. First-time B2B buyers can request samples for real-machine compatibility and capacity verification before committing to a bulk order. Samples typically dispatch within 3–5 business days. Bulk orders are available with flexible minimum quantities — suitable for both repair shop replenishment stock and large-scale distributor inventory builds. Pricing is tiered by volume, with meaningful cost reduction at higher quantities. Contact us directly for a formal quote sheet.

Q6: What are the air freight requirements for shipping Li-ion batteries, and do you provide compliance documents?

The PA5109U-1BRS ships under UN 3481 classification (lithium-ion batteries contained in or packed with equipment). It is compatible with major express air freight carriers including FedEx International Priority and DHL Express. We provide a complete compliance document package with every shipment — SDS, MSDS, and the UN 3481 shipper’s declaration — so your customs broker has everything needed without chasing us post-shipment. For large volume orders, sea freight (LCL or FCL) is strongly recommended; per-unit freight cost drops by 60%+ compared to air.