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Description
Replacement bti battery for toshiba e45t series e45t-a4100 e45t-a4200 e45t-a4300e45t-ast2n01 e45t-ast2n02 e55 series e55-a5114 e55t series e55t-a5320 e55t-ast2n01 u940 11.4v 4160mah li-ion 50 whr 3 cellMeet the BTI Battery, a premium replacement designed to power a wide range of laptops in the E45T and E55T families, plus U940. Engineered to align with OEM specifications PA5157U 1BRS and P000577250, this battery ensures a seamless install and dependable performance. The BTI Battery features a proprietary size that provides a precise fit in the battery bay, reducing the risk of loose connections and ensuring reliable contact with the devices power
Meet the BTI Battery, a premium replacement designed to power a wide range of laptops in the E45T and E55T families, plus U940. Engineered to align with OEM specifications PA5157U-1BRS and P000577250, this battery ensures a seamless install and dependable performance. The BTI Battery features a proprietary size that provides a precise fit in the battery bay, reducing the risk of loose connections and ensuring reliable contact with the device’s power system. If you own an E45T-A4100, E45T-A4200, E45T-A4300, E45T-AST2N01, E45T-AST2N02, E55T-A5114, E55T-A5320, E55T-AST2N01, or U940, you’ll appreciate the balance of compatibility, safety, and efficient charging this battery delivers. In addition, the BTI Battery is noted for faster charging times, helping you cut downtime and stay productive when you need power most.
- Broad compatibility with OEM references: Specifically designed to work with PA5157U-1BRS and P000577250, covering a spectrum of models in the E45T and E55T series as well as U940. This ensures a reliable replacement option that mirrors the performance of your original battery.
- Faster charging performance: The BTI Battery is engineered to take lesser time to charge compared with standard batteries, helping you reduce downtime and get back to work or play quicker after every recharge.
- Proprietary battery size for reliable fit: The battery uses a proprietary footprint intended to provide a snug, secure fit in compatible devices, improving contact stability and reducing the chance of movement or misalignment during use.
- Consistent power delivery and longer life: Built to deliver steady voltage and dependable capacity across cycles, the BTI Battery supports extended runtimes and dependable performance for everyday computing tasks and multimedia use.
- Durable construction with safety-conscious design: Crafted to withstand daily wear and tear, with attention to safety and quality standards to minimize risks during charging and operation, so you can rely on power when you need it most.
Technical Details of BTI Battery
- OEM compatibility: PA5157U-1BRS, P000577250
- Compatible models and series: E45T-A4100, E45T-A4200, E45T-A4300, E45T-AST2N01, E45T-AST2N02, E55-A5114, E55T-A5320, E55T-AST2N01, U940
- Proprietary battery size: Proprietary design with a precise fit for supported models
- Charging performance: Designed to deliver faster charging times relative to standard batteries
- Core design and reliability: Built to maintain stable power delivery through repeated charge-discharge cycles
How to Install BTI Battery
- Prepare and power down: Turn off your device, unplug from any power source, and remove any peripherals. This reduces the risk of electrical shock and protects internal components during replacement.
- Access the battery: In most models, remove the back cover or access panel to locate the existing battery. Use the appropriate screwdriver to open the panel carefully.
- Disconnect the old battery: Gently disconnect the battery connector from the motherboard or power hub. If clips or screws secure the battery, remove them and set the old battery aside.
- Install the BTI Battery: Align the BTI Battery with the battery bay, connect the connector securely, and ensure the battery sits flush with the chassis. Reinstall any screws or retention clips that held the old battery in place.
- Reassemble and test: Reattach the back cover, reconnect power, and power on the device. Allow the battery to reach a full charge before first use to calibrate the system’s battery gauge.
Frequently Asked Questions
- Q: Is this BTI Battery compatible with my device? A: The BTI Battery is designed to be compatible with OEM PA5157U-1BRS and P000577250, covering E45T-A4100, E45T-A4200, E45T-A4300, E45T-AST2N01, E45T-AST2N02, E55-A5114, E55T-A5320, E55T-AST2N01, and U940 models. If your device matches these series or models, this battery should fit as a replacement.
- Q: How long does charging take with this battery? A: The BTI Battery is noted to take lesser time to charge compared with many other batteries, helping you reduce downtime and stay productive.
- Q: How should I care for this battery to maximize life? A: For optimal longevity, avoid extreme temperatures, aim to keep the battery between 20% and 80% where practical, and perform a full calibration after extended storage or first use after installation. Regularly update device firmware to ensure accurate battery reporting.
- Q: Is this an official OEM replacement? A: This battery is a compatible OEM replacement designed to match the referenced OEM specifications (PA5157U-1BRS, P000577250). It provides OEM-style performance and reliability while offering a cost-effective alternative to original equipment manufacturer batteries.
- Q: What models does the proprietary size fit? A: The proprietary size is tailored for a specific subset of E45T and E55T series devices and U940. Confirm your model matches the listed compatibility before purchasing to ensure proper fit and performance.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
Great quality pillows. Very difficult wrapping.
Color: White, Size: King (Pack of 2)
The Pillows are the real deal. Very fluffy but with good support. I was surprised by the weight of the box they came in, pretty heavy so you know there’s good quality pillows inside.
The one negative is that the pillows are packed in very very tight plastic because they come compressed. But the thing is, it’s really a chore to open them. You have to be careful not to cut through the plastic to the material, but the plastic is put on so incredibly tight that it’s even hard to get your finger underneath.
But I found a way to open them. Near the top, insert A very flat metal ruler as far in as you could get it. Then cut through the plastic that’s above the metal ruler. That prevents a sharp tool from damaging the pillows. As you get through the plastic above the ruler, keep pushing the ruler further down into the package. Believe me, this simplifies what could be a very difficult unpacking. I am very surprised that the company that makes them does not insert the type of opener that you find on boxes you receive in the mail or even packages that you get from the grocery store where you just pull a tab and that opens the package.
These are really good pillows, but you must be very careful about using a sharp object when opening the box and when trying to cut through the plastic. I am a strong man and have the tools needed, a very flat metal ruler, and a box cutter, knife, or razor. Good luck. !!
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Reviewed in the United States on May 5, 2026
★★★★★ 5
These hold up very well
Color: White, Size: Standard (Pack of 2)
I have NO luck with pillows. I’ve been in stores & tried them. They seemed ok there. At home, nope. I’ve been getting headaches & neck aches from lousy pillows. I’ll change one, a few nights relief. It doesn’t help that I’m prone to headaches. After reading about different pillows, I settled on these. The reviews were better than so many different ones I was looking at. Including high priced & brand names. I bought the standard size. When I saw, “Customers Usually Keep This”, I kept my fingers crossed. When I received them, I took one out of the package & put my head on it & thought, oh no! This is too hard! I tried it again. Ok….. I slept on it & haven’t had any pains since. It’s soft but firm enough to keep my head from sinking & messing up my neck. I don’t move. No more flipping my pillow over. My head doesn’t go below my neck anymore! This has been 2 months now, but it hasn’t changed at all. I wake up happy, not complaining. No more pains or headaches. This saved me from losing days with a heating pad or an ice pack. The price was excellent for 2 pillows. I can’t believe a blind buy was the answer! These are incredible. Finally, something worked for me.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Awesome Pillows!
Color: White, Size: King (Pack of 2)
These pillows are super soft! I love them. I bought them when I caught a bad cold and needed to prop myself up. Worked so great! Definitely give these pillows a try. They're very reasonably priced too.
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Comfortable pillows
Color: White, Size: Standard (Pack of 2)
These pillows are great. Not too soft or to hard. They need to be in the dryer for about 15 minutes to fluff up. Perfect buy!
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Reviewed in the United States on April 23, 2026
★★★★★ 5
Don’t judge by the size
Color: White, Size: Standard (Pack of 2)
I don’t write reviews here typically but I’ve been on the pillow hunt for years with no luck. Mine are always lumpy and misshapen or too soft or too firm. Don’t judge this pillow by how it looks though because I saw it and thought for sure I wasted money. They are small and not fluffy at all. But OMG I laid down on it and it’s the most comfortable pillow I’ve had in years. Memory foam didn’t work for me but this simple little pillow just allowed me some great sleep. Very happy with this purchase. It’s a simple, no frills pillow that’s perfect for this side sleeper that doesn’t like a too soft pillow.
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Reviewed in the United States on April 11, 2026