MakerHawk3.7V 4000mAh LiPo Battery Rechargeable 1S 3C 124065 Lithium Polymer Battery with Protection Board Insulated Rubber Tape, Micro JST 1.25 Plug for Arduino ESP32 Development Board (1 Pack)

I have purchased the 1,2,4,10ah versions for my nodes. For single day use the 1ah version is tiny and last 11h ilon ESP32 and days on nRF54 based nodes. The 2ah gets an ESP32 all day. The 4ah is weeks of nRF54 use.I'm using thr 4ah size in my Heltec T114v2 solar node.

Nice battery for the price. It lasts me about 15 hours on an esp32 setup. The size is as described, though the protective corners make it a little tight.

It's a chunky lipo for a decent price. It'll work well for lower power devices. It measures ~11.9x39.7x65.58mm.

These 4000mah batteries are NOT the advertised physical dimensions. They are a 3mm thicker than shown in the listing. Listings need to be accurate and describe the items on offer with exacting precision. Buyers should not have to make a purchase hoping for something "close-enough". A lot of this is happening on Amazon and it needs to stop!

I verified that the batteries have the statef capacity and work great for my use

works perfect for my projects and performs well.

I couldn’t be happier with this battery! It’s the perfect addition to any project that requires a dependable power source. I’ve been using it with my ESP32 development board, and it’s been incredibly reliable. The capacity is fantastic—it lasts much longer than I expected for a single-cell battery. I’ve been able to run my setup for hours without worrying about recharging.One of the standout features is the built-in protection board. It adds peace of mind, knowing the battery is safeguarded against overcharging and short circuits. The inclusion of insulated rubber tape and the micro JST plug made it super easy to integrate into my project without needing extra components or tools. The connections feel solid, and the build quality is excellent.What really impressed me is how compact and lightweight it is, despite the impressive capacity. It fits neatly into tight spaces, making it ideal for portable applications. Whether you’re building a sensor, experimenting with Arduino projects, or need a replacement battery, this one delivers consistent performance.I highly recommend this battery for anyone working on DIY electronics. It’s reliable, easy to use, and offers great value for the price. Definitely worth it!

I used this MakerHawk 3.7V 4000mAh LiPo battery for a smaller electronics project, and it has been flawless. After approximately 25 charge and discharge cycles, it shows no signs of puffing or capacity loss, delivering consistent and dependable power.The built-in protection board adds an essential layer of safety, while the insulated rubber tape and Micro JST 1.25 plug make it easy to integrate into my setup. The battery is compact yet offers a generous capacity, making it ideal for powering Arduino or ESP32 development boards and other small electronics projects.This battery is an excellent choice for anyone needing a rechargeable, high-capacity solution for electronics. Highly recommend it for its performance and reliability!