Find a Retailer SHOP PRODUCT MENU BLOG find products, tutorials, etc... HOME / P R O D U C T C A T E G O R I E S LEARN 0 SUPPORT LOG IN Need Help? REGISTER EDUCATION FORUM / BATTERY / POLYMER LITHIUM ION BATTERY - 40MAH Polymer Lithium Ion Battery - 40mAh P R T - 1 3 8 5 2 ROHS DESCRIPTION FEATURES DOCUMENTS This is an extremely tiny and light weight battery based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 40mAh. This may sound like not so much power, but the cell is really tiny... like, about half an inch square! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging. Do not attempt to charge these with anything but a specialized Lithium Polymer charger. Battery includes built-in protection against over voltage, over current, and minimum voltage. Please use caution when using this battery in wearable projects. When using conductive thread, a short in the thread can create sparks and heat. We recommend using coin cell batteries for beginners. Note: This battery is not available to ship to Alaska or Hawaii, or through any express services (2-day, overnight), or internationally. This is temporary! Check out our blog post for more information. Additionally orders may take longer to process and therefore do not qualify for same-day shipping. Sorry for any inconvenience this may cause! images are CC BY 2.0 Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please do not hesitate to contact us to see if further actions may be taken. SHARE Previous Versions Tags 40MAH BATTERY LIPO LITHIUM ION LITHIUM POLYMER POWER PROTOTYPING Polymer Lithium Ion Battery - 40mAh Product Help and Resources SKILLS NEEDED Core Skill: Electrical Prototyping If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics. Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components. See all skill levels 2 COMMENTS 4 REVIEWS 0 Customer Comments Log in or register to post comments. Member #837611 / about a year ago / 1 I make my own design with the LTC4081 from Linear or the STNS01 from ST. Member #131137 / about a year ago / 1 Member #837611 / about a year ago / 1 How can you charge one of these little 40mah lipos? I guess there is a mistake in the Datasheet. The black wire is written as + and the red wire is written as -. MikeMoretti / about 2 years ago / 1 What can we use to charge these? I don't see any charger boards in your catalog that do anything under 100mA... START SOMETHING. SUBSCRIBE TO NEWSLETTER In 2003, CU student Nate Seidle blew a power supply in his dorm room and, in lieu of a way to order easy replacements, decided to start his own company. Since then, SparkFun has been committed to sustainably helping our world achieve electronics literacy from our headquarters in Boulder, Colorado. No matter your vision, SparkFun's products and resources are designed to make the world of electronics more accessible. In addition to over 2,000 open source components and widgets, SparkFun offers curriculum, training and online tutorials designed to help demystify the wonderful world of embedded electronics. We're here to help you start something. About Us About SparkFun SparkFun Education Feeds Jobs Contact Help Customer Service Shipping Return Policy FAQ Chat With Us Programs Become a Community Partner Community Stories Custom Kit Requests Tell Us About Your Project Sell Your Widget on SparkFun Become a SparkFun Distributor Large Volume Sales Community Forum SparkFun IRC Channel Take the SparkFun Quiz SparkFun Kickstarter Projects Distributors What's on your mind? For which department? General Please include your email address if you'd like us to respond to a specific question. email address SUBMIT SparkFun Electronics (R) / Niwot, Colorado / Customer Service / Site Map / Terms of Service / Privacy Policy