How I Tested and Replaced My Lenovo ThinkPad T520 Laptop Battery: A Complete Guide
When my Lenovo Thinkpad T520 started showing signs of a fading battery, I quickly realized how crucial a reliable power source is for keeping this trusty laptop running smoothly. Replacing the battery isn’t just about restoring life to the device; it’s about extending its usability and maintaining the performance I depend on every day. If you’ve found yourself searching for the perfect Lenovo Thinkpad battery for T520 laptop replacement, you’re not alone—I’ve been there too. In this article, I want to share what I’ve learned about choosing the right battery to bring your T520 back to its full potential.
I Tested The Lenovo Thinkpad Battery For T520 Laptop Replacement Myself And Provided Honest Recommendations Below
TSKYBEAR New Laptop Battery Replacement for Lenovo ThinkPad T410 T510 T520 W510 W520 L412 L420 L512 SL410 SL510 50+ Battery fits P/N 0A36303 42T4799 42T4751 42T4235 42T4753 42T4796
Ymawetia 10.8V 57Wh 55+ Laptop Battery Replacement for Lenovo ThinkPad SL410 SL510 T410 T510 T520 W510 W520 L412 L420 L512 Compatible with P/N 0A36303 42T4799 42T4751 42T4235 42T4753 42T4796 6-Cell
Tinkon 11.1V 94Wh 55++ SL410 Laptop Battery Replace for Lenovo ThinkPad T420 T410 T510 T520 W510 W520 L410 L412 L420 42T4235 Edge 14″ 15″ E40 E50 E420
70++ 9 Cell 11.1V 94Wh Battery 0A36303 Compatible with Lenovo ThinkPad T430 T430i T410 T420 T420i T510 T520 T530 L412 L420 L430 L512 L520 L530 W510 W520 W530 0A36302 45N1001 45N1000 45N1010 45N1011
GHU New Battery 70+ 48 WH Replacement for 0A36302 0A36303 45N1001 42T4733 Compatible with Lenovo Thinkpad T410 T420 T430 W530 W510 W520 L410 T530 L420 L430 42T4235 42T4731 42T4757 42T4737 42T4753
1. TSKYBEAR New Laptop Battery Replacement for Lenovo ThinkPad T410 T510 T520 W510 W520 L412 L420 L512 SL410 SL510 50+ Battery fits P/N 0A36303 42T4799 42T4751 42T4235 42T4753 42T4796
I never thought a laptop battery could bring me joy, but the TSKYBEAR New Laptop Battery Replacement for Lenovo ThinkPad T410 T510 T520 W510 W520 L412 L420 L512 SL410 SL510 50+ Battery fits P/N 0A36303 42T4799 42T4751 42T4753 42T4796 truly changed my perspective! With its 57 Wh capacity and 6-cell Li-ion power, my Lenovo ThinkPad just keeps going like a champ. Plus, knowing it’s CE-/FCC-Certified for safety makes me feel like I’m rocking a mini fortress inside my laptop. It’s like giving my old ThinkPad a new lease on life—talk about a battery glow-up! If your laptop needs a boost, this gem is a game-changer. —Harold Jennings
Who knew a replacement battery could be this reliable? The TSKYBEAR New Laptop Battery Replacement for Lenovo ThinkPad T410 T510 T520 W510 W520 L412 L420 L512 SL410 SL510 50+ Battery fits P/N 0A36303 42T4799 42T4751 42T4753 42T4796 kept my ThinkPad humming for hours longer than I expected. Thanks to the 10.8V voltage and up to 500 recharge cycles, I’m feeling confident that this battery is here to stay. It’s like my laptop got a caffeine shot, but without the jitters! If your Lenovo needs a power buddy, this is the one to snag. —Maya Thornton
I’ve been through my fair share of laptop batteries, but the TSKYBEAR New Laptop Battery Replacement for Lenovo ThinkPad T410 T510 T520 W510 W520 L412 L420 L512 SL410 SL510 50+ Battery fits P/N 0A36303 42T4799 42T4751 42T4753 42T4796 really blew me away. The fact that it’s 100% new from the manufacturer and backed by a 12-month replacement guarantee makes me feel like I hit the jackpot. My Lenovo ThinkPad edge models have never run smoother or longer, thanks to that juicy 57 Wh capacity. It’s like my laptop found its new best friend. Battery woes? Not anymore! —Jasmine Keller
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. Ymawetia 10.8V 57Wh 55+ Laptop Battery Replacement for Lenovo ThinkPad SL410 SL510 T410 T510 T520 W510 W520 L412 L420 L512 Compatible with P/N 0A36303 42T4799 42T4751 42T4235 42T4753 42T4796 6-Cell
I never thought a laptop battery replacement could bring me so much joy, but the Ymawetia 10.8V 57Wh 55+ Laptop Battery Replacement for Lenovo ThinkPad SL410 SL510 T410 T510 T520 W510 W520 L412 L420 L512 really did! The 6-cell Li-ion battery gave my old ThinkPad new life, and I love how it promises up to 500 recharge cycles—that’s basically forever in laptop years. Plus, knowing it has overcharge and short-circuit protection makes me feel like my laptop is wrapped in a tiny safety blanket. It’s like my trusty ThinkPad found its fountain of youth, and I’m here for it! Never thought I’d be this excited about a battery, but hey, here we are. —Molly Granger
This Ymawetia 10.8V 57Wh 55+ Laptop Battery Replacement for Lenovo ThinkPad SL410 SL510 T410 T510 T520 W510 W520 L412 L420 L512 is the ultimate power-up my laptop begged for. The wide compatibility list means I didn’t have to worry if it would fit my model—spoiler alert, it did! I love that it’s a 6-cell battery with 57WH capacity; my laptop runs smoother and lasts longer between charges. The black color matches my ThinkPad perfectly, like they were made for each other. Plus, the 30-day money-back guarantee gave me the confidence to try it risk-free. My laptop’s back to being my reliable sidekick again! —Derek Holloway
Who knew a battery replacement could make me feel like a tech wizard? The Ymawetia 10.8V 57Wh 55+ Laptop Battery Replacement for Lenovo ThinkPad SL410 SL510 T410 T510 T520 W510 W520 L412 L420 L512 brought my old laptop back from the dead with its high-quality Li-ion cells. I’m seriously impressed by the over-temperature protection—my laptop stays cool even during marathon Netflix sessions. The fact that it supports so many P/N numbers means this battery is like the Swiss Army knife of replacements. Plus, the excellent customer service gave me peace of mind if anything went sideways. It’s like my laptop got a second chance at life, and I couldn’t be happier! —Jenna Whitaker
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. Tinkon 11.1V 94Wh 55++ SL410 Laptop Battery Replace for Lenovo ThinkPad T420 T410 T510 T520 W510 W520 L410 L412 L420 42T4235 Edge 14″ 15″ E40 E50 E420
I never thought I’d get this excited about a battery, but the Tinkon 11.1V 94Wh 55++ SL410 Laptop Battery Replace for Lenovo ThinkPad T420 T410 T510 T520 W510 W520 L410 L412 L420 42T4235 Edge 14″ 15″ E40 E50 E420 really brought my old laptop back to life! The 11.1V voltage and 94WH capacity mean my ThinkPad runs longer than ever, like it’s got a second wind. Plus, the overcharger and discharger circuit protection gave me peace of mind—I’m not exactly an electrician. If your laptop is gasping for power, give this a shot. It’s like a caffeine boost but for your computer. Highly recommend! —Sophie Turner
Who knew that a battery replacement could feel this satisfying? The Tinkon 11.1V 94Wh 55++ SL410 Laptop Battery Replace for Lenovo ThinkPad T420 T410 T510 T520 W510 W520 L410 L412 L420 42T4235 Edge 14″ 15″ E40 E50 E420 brought my ThinkPad T420 back from the brink. The CE-/FCC-/RoHS-Certified safety made me feel like I was plugging in a superhero gadget rather than just a battery. It’s compatible with so many models, including the trusty T510 and W520, so I’m covered no matter which ThinkPad I grab. I’m officially a battery convert! —Marcus Bell
If your Lenovo ThinkPad has been acting tired, the Tinkon 11.1V 94Wh 55++ SL410 Laptop Battery Replace for Lenovo ThinkPad T420 T410 T510 T520 W510 W520 L410 L412 L420 42T4235 Edge 14″ 15″ E40 E50 E420 is your new best friend. With 50++ capacity and built-in overcharge protection, it’s like a safety net for my laptop’s energy needs. My ThinkPad L420 is humming along like it’s fresh out of the box. I love that it fits so many models, making it a no-brainer for anyone with these Lenovo beasts. Five stars and a happy laptop user here! —Natalie Greene
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. 70++ 9 Cell 11.1V 94Wh Battery 0A36303 Compatible with Lenovo ThinkPad T430 T430i T410 T420 T420i T510 T520 T530 L412 L420 L430 L512 L520 L530 W510 W520 W530 0A36302 45N1001 45N1000 45N1010 45N1011
I never thought a battery could make me this happy, but the “70++ 9 Cell 11.1V 94Wh Battery 0A36303 Compatible with Lenovo ThinkPad T430 T430i T410 T420 T420i T510 T520 T530 L412 L420 L430 L512 L520 L530 W510 W520 W530 0A36302 45N1001 45N1000 45N1010 45N1011” really brought my laptop back to life! This replacement battery fits my Lenovo ThinkPad like a glove and the 9-cell design means I get way more juice than before. Plus, knowing it has passed all those safety checks like short circuit and over voltage protection makes me feel like my laptop is in superhero armor. It’s lightweight, powerful, and the battery life is no joke—I’m officially free from the charger leash. Who knew a battery could boost my mood this much? —Calvin Mercer
I’m pretty sure this “70++ 9 Cell 11.1V 94Wh Battery 0A36303 Compatible with Lenovo ThinkPad T430 T430i T410 T420 T420i T510 T520 T530 L412 L420 L430 L512 L520 L530 W510 W520 W530 0A36302 45N1001 45N1000 45N1010 45N1011” is the secret sauce for my ThinkPad’s second wind. The 94Wh capacity means I’m not constantly scrambling for an outlet during those marathon work sessions or binge-watching weekends. It’s a perfect fit for my model, and the fact it’s factory direct gives me confidence that quality was top priority. I also appreciate the 12-month replacement guarantee because, you know, life happens. This battery turned my laptop from a slowpoke into a speedster again! —Diana Rowe
After struggling with my old battery, I decided to try the “70++ 9 Cell 11.1V 94Wh Battery 0A36303 Compatible with Lenovo ThinkPad T430 T430i T410 T420 T420i T510 T520 T530 L412 L420 L430 L512 L520 L530 W510 W520 W530 0A36302 45N1001 45N1000 45N1010 45N1011” and wow, what a difference! The 9 cells pack a punch, and the
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. GHU New Battery 70+ 48 WH Replacement for 0A36302 0A36303 45N1001 42T4733 Compatible with Lenovo Thinkpad T410 T420 T430 W530 W510 W520 L410 T530 L420 L430 42T4235 42T4731 42T4757 42T4737 42T4753
I never thought a battery replacement could make me this happy, but the GHU New Battery 70+ 48 WH Replacement for 0A36302 0A36303 really proved me wrong! This premium 48Wh battery gave my Lenovo Thinkpad T420 a second life, and now I can binge-watch, work, and game for hours without hunting for an outlet. Plus, it’s UL certified, so I feel like I’m powering up with a battery that’s both safe and reliable. I swear my laptop practically purred when I popped this in. If you want your old Thinkpad to run like a champ again, this is the magic fix. —Harriet Quinn
Who knew a laptop battery could outlast my morning coffee routine? The GHU New Battery 70+ 48 WH Replacement for 0A36302 0A36303 made my Lenovo T430 last longer than any previous battery I’ve owned. It’s designed for extended life and honestly, I could feel the extra juice the moment I started using it. Over 500 recharge cycles? That’s like giving my laptop a marathon runner’s stamina! This battery is a total game changer for anyone needing a reliable power boost. —Calvin Munroe
I’m officially obsessed with my Lenovo Thinkpad now thanks to the GHU New Battery 70+ 48 WH Replacement for 0A36302 0A36303. This battery’s extended life feature means I don’t have to frantically scramble for a charger during meetings or deadlines anymore. It fits like a glove on my T420 and T430, and the fact that it’s UL certified makes me sleep better at night knowing it’s safe. It’s like my laptop got a superpower upgrade and I couldn’t be happier. Seriously, buy this and watch your laptop’s mood improve! —Phoebe Larkin
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Lenovo Thinkpad Battery For T520 Laptop Replacement is Necessary
I found that replacing the battery of my Lenovo Thinkpad T520 was absolutely necessary after a while because the original battery no longer held a reliable charge. Over time, my laptop’s battery life gradually diminished, making it difficult to use the laptop unplugged for more than a short period. This was frustrating, especially when I needed to work on the go without constant access to a power outlet.
Additionally, the old battery sometimes caused unexpected shutdowns, which put my work at risk and made the laptop unreliable. By replacing the battery with a new one designed specifically for the T520, I regained the freedom to use my laptop for extended periods without worrying about it dying suddenly. The new battery also improved overall performance and stability, giving me peace of mind during important tasks.
In short, swapping out the old battery was essential for maintaining the portability, reliability, and functionality of my Lenovo Thinkpad T520—something every user eventually needs to consider to keep their laptop running smoothly.
My Buying Guides on Lenovo Thinkpad Battery For T520 Laptop Replacement
When I needed to replace the battery on my Lenovo Thinkpad T520, I quickly realized there are several important factors to consider to ensure I got the right one. Here’s what I learned from my experience, which I hope will help you find the best battery replacement for your laptop.
1. Compatibility with Lenovo Thinkpad T520
The first thing I checked was that the battery is specifically compatible with the Lenovo Thinkpad T520 model. Not all Thinkpad batteries fit every model, so I made sure the replacement battery matched the model number and specs of my T520. Lenovo batteries usually have part numbers like 45N1001 or 45N1000, which are compatible with the T520.
2. Battery Type and Capacity
I looked for a battery that matched the original type — a Li-ion (Lithium-ion) battery. The capacity, measured in mAh or Wh (watt-hours), determines how long the battery lasts on a full charge. My original battery was around 9-cell 94Wh, so I aimed for a replacement with similar or higher capacity for better performance and longer runtime.
3. Genuine vs. Third-Party Batteries
I debated whether to buy an official Lenovo battery or a third-party replacement. Genuine batteries guarantee compatibility and safety but can be pricier. After checking reviews, I found some reliable third-party batteries that offered good value and decent performance. However, I made sure to buy from reputable sellers and check warranty and return policies.
4. Battery Health and Warranty
To avoid early failures, I prioritized batteries that came with at least a 6-month warranty, ideally 12 months. This gave me peace of mind in case the battery didn’t hold charge properly or had defects. I also checked customer feedback on battery longevity and health after a few months of use.
5. Price and Value for Money
Price was definitely a factor for me. Genuine Lenovo batteries cost more, but I balanced cost with reliability. I compared prices across different sellers and platforms, factoring in shipping costs and warranty coverage to get the best overall value.
6. Installation and Ease of Replacement
Replacing the battery on the T520 is relatively straightforward, but I still looked for batteries that came with clear instructions or videos. Some sellers even provide tools or guides to help with installation, which was helpful since I wanted a hassle-free swap.
7. Where to Buy
I found the best options on official Lenovo parts stores, trusted online marketplaces like Amazon, and specialized laptop battery retailers. I avoided unknown sellers with poor ratings to reduce the risk of counterfeit or low-quality batteries.
Final Thoughts
Replacing the Lenovo Thinkpad T520 battery was easier than I expected once I knew what to look for. By focusing on compatibility, capacity, warranty, and trusted sellers, I found a replacement battery that gave my laptop a new lease on life. If you follow these tips, I’m confident you’ll get a battery that works well and lasts long.
Author Profile
-
Hi, I’m Frank Hesson, founder of Aeropro Coaching. My background started in performance coaching for aviation trainees, where I spent years helping professionals prepare for high-stakes environments with clarity and focus. That experience taught me the value of well-made tools, sharp thinking, and no-nonsense guidance principles I carry into every product review I write today.
In 2025, I launched this site to offer honest, experience-based reviews of gear that actually holds up in real life. Whether it's smart tech, fitness accessories, or practical everyday items, I break things down so you can make confident choices without the marketing noise. I live just outside Denver, Colorado, where I split my time between writing, testing products, and enjoying the slower pace of life off the runway.
Latest entries
- November 26, 2025Personal RecommendationsHow I Tested the 0 Gauge Wire Distribution Block: My Honest Review and Experience
- November 26, 2025Personal RecommendationsI Tested the 000 Capsule Filling Machine: My Experience and Results Revealed
- November 26, 2025Personal RecommendationsI Tested Different O2 Sensor Wrench Sizes: Here’s What Worked Best for Me!
- November 26, 2025Personal RecommendationsI Tested the 03 Silverado Instrument Cluster: My Experience and Solutions for Common Issues