Skip to product information
LiPo BMS Battery Tester and Low Voltage Alarm for 1-8 cell Packs
LiPo BMS Battery Tester and Low Voltage Alarm for 1-8 cell Packs
LiPo BMS Battery Tester and Low Voltage Alarm for 1-8 cell Packs
LiPo BMS Battery Tester and Low Voltage Alarm for 1-8 cell Packs
1 of 2

LiPo BMS Battery Tester and Low Voltage Alarm for 1-8 cell Packs


Regular price $9.00
Regular price Sale price $9.00

Shipping calculated at checkout.


This external battery management system(BMS) unit plugs directly into the 1S-8S JST-XH style balancing tap on your battery pack during discharge and notifies you when to stop running the pack via Low Voltage Alarm(LVA). Prolong your battery life by not allowing the voltage on your LiPo pack to drop too low. It can also be used to check the status of your battery at any time. This external BMS measures 43mm x 30mm x 14mm and weighs only 10 grams. Do NOT leave the unit plugged into your pack while not in use as it will slowly drain the battery dead if you do.

  • Can be used for a LiPo 3.7v(1-cell pack) up to a 29.6v(8-cell pack).
  • Voltage detection precision of 0.01v
  • Red LED will flash when a cell drops below programmed voltage setting(default is 3.3 volts but this can easily be changed to your preference by pressing the key button located near speakers).
  • A loud audible alarm will also sound when a cell drops below programmed voltage setting.  This is your indication to stop your vehicle in order to prevent over-discharging your LiPo battery pack.
  • Unplug your battery pack from the speed control(ESC) and unplug the LVA from the battery pack.

Instructions for Low Voltage Alarm

Lifetime Battery Warranty

MaxAmps offers a one-time, non-transferable lifetime warranty on any battery with a factory defect. Batteries that fail from improper storage or a use error are not covered. Replacements only apply to products purchased from MaxAmps and does not cover any other loss.

WARNING:Do not charge unattended! The user must have an appropriate understanding of the potential dangers of lithium batteries before purchase and usage. No expressed or implied guarantee of compatibility, suitability, or fitness for any particular purpose or device can be made.

  • ONLY use with proper protection circuitry
  • DO NOT short circuit intentionally or unintentionally
  • KEEP AWAY from metal/conductive objects to prevent short circuiting
  • DO NOT use if battery, wrapper or terminal insulator is damaged or torn
  • DO NOT over-charge or charge above the maximum voltage rating
  • DO NOT over-discharge or exceed the continuous discharge rating
  • DO NOT modify, disassemble, puncture, cut, crush, or incinerate
  • DO NOT expose to liquids or high temperatures
  • KEEP AWAY from pets and children
  • ALWAYS charge in or on a fire-proof surface and never leave batteries charging unattended
  • ONLY use a smart charger designed for this specific type of battery
  • DO NOT mix and match brands and models, old and new, used and unused batteries
  • STOP immediately if while charging/storing/using the battery it emits an unusual smell, feels hot, changes color or shape, or appears abnormal in any way
  • It is your responsibility to determine that your charger or device is functioning properly
  • If exposed to battery electrolyte, flush with water immediately and/or immediately contact a physician or emergency services
  • DO NOT throw away in the trash; contact your local jurisdiction for proper recycling or disposal

If in the first 30 days, you are not completely satisfied, you can send your items back for a replacement or your money back. This does not include shipping charge and does not apply to custom built batteries. You pay the return shipping charge and we pay for the replacement to be sent to you.

Shipping Policy
For domestic US shipping, we ship via FedEx, UPS, or USPS. If you prefer a certain carrier, please specify in the notes on your order. We offer Standard 3-5 day shipping on orders to US locations. If you need it faster, we offer express 1-2 Day Express shipping. Contact us for Overnight shipping options. Because lithium batteries are considered dangerous goods, carriers do not guarantee overnight shipping, but they do offer it. In our experience, we have had a 90%+ success rate using overnight shipping.

For international shipping, we primarily ship via FedEx Priority but we also offer UPS Standard Ground to Canada. If your country is not listed on the website, we may still be able to ship to your country. You will need to contact us for a custom shipping quote. Be aware that our shipping costs cover postage and insurance on the package but not import costs such as duties, taxes, or broker fees.

Tracking details will be emailed at the time of shipment. Please allow time for the online tracking status to update.

We make every effort to ship within 24 business hours. If you need your order to arrive by a certain date, be sure to contact us directly and we will do our best to satisfy your request. For possible lost in transit shipments, please contact us immediately so that we can contact the carrier.

Some batteries must be shipped as fully regulated dangerous goods and will arrive to you with a 30% charge. We recommend charging up to 60-70% shortly after receipt. In addition, our lithium batteries have passed UN38.3 Testing making them safe for transport. This test summary can be viewed/downloaded via this link if needed. 

Privacy Policy
This privacy policy discloses the privacy practices for ( By using our site, you consent to this privacy policy.

Information Collection, Use, and Sharing: We are the sole owners of the information collected on this site. We only collect information that you voluntarily give us via email, through ordering and/or registering, or other direct contact from you. We will not sell or rent this information to anyone. We will use your information to respond to you regarding the reason you contacted us. We will not share your information with any third party outside of our organization, other than as necessary to fulfill your request, e.g. to ship an order.

Unless you ask us not to, we may contact you via email in the future to tell you about specials, announcements, or changes to this privacy policy. You can do the following at any time by contacting us via the email address or phone number given on our website: see what data we have about you if any, change/correct any data we have about you, have us delete any data we have about you, or express any concern you have about the use of your data.

Security: We take precautions to protect your information. Wherever we collect sensitive information, such as credit card data, that information is encrypted and transmitted to us in a secure way. You can verify this by looking for a closed lock icon at the bottom of the page you are on, or looking for “https” at the beginning of the address of the web page. While we use encryption to protect sensitive information transmitted online, we also protect your information offline. Only employees who need the information to perform a specific job (for example, billing, customer service, or shipping) are granted access to personally identifiable information. The computers and servers in which we store personally identifiable information are kept in a secure environment.

Cookies: We use cookies on this site. A cookie is a piece of data stored on a site visitor’s hard drive to help us improve your access to our site. For instance, when we use a cookie to identify you, you would not have to login a password more than once, thereby saving time while on our site. Cookies can also enable us to track and target interests of our users to enhance the experience on our site. Usage of a cookie is in no way linked to any personal identifiable information on our site.

Links: This website contains links to other sites. Please be aware that we are not responsible for the content or privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of any other site that collects personally identifiable information.

Updates: Our Privacy Policy may change from time to time and all updates will be posted on this page. This policy was last modified on 12/20/19.

If you feel that we are not abiding by this privacy policy, you should contact us immediately.

Terms of Service
User Agreement: This agreement is governed in accordance with the laws of the State of Washington. All users agree, through the use of this website, to the terms and conditions contained on this website. User hereby agrees to the exclusive jurisdiction in accordance to the courts of the State of Washington and any federal jurisdiction for any and all litigation. Please review all additional policies, such as the Privacy Policy, Liability Policy, Returns Policy, and Shipping Policy posted on this page. reserves the right to change or modify these policies at any time without prior notice.

Copyright Protection: All content on this Website ( are copyright. Any other use of materials on this Website without the prior written permission of is strictly prohibited. is not responsible for any content placed online by customers, including such content posted to alternate social media forums and third-party websites.

Trademark Protection: Trademarks, such as, are either trademarks or registered trademarks of These trademarks may not be used in any way, except by the express written permission of, that may interfere with the business process or credit of Other products and company names mentioned on this Website may be the trademarks or registered trademarks of their respective owners.

Website Liability:, nor any of its affiliates, owners, employees, and/or other representatives will be liable for damages arising from or in-direct relation to the use of this Website. This includes all information, content, materials, and/or products included within this Website. reserves the right to cancel or refuse orders at our sole discretion. Please contact us immediately if you become aware of any errors or discrepancies.


Show More

Payment & Security

Payment Methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.


Security Image

Customer Reviews

Based on 2 reviews
Simple and it works

This item came with my recent order. Its simple and it works.

Brent T., Richmond VA
Brent T., Richmond VA

I have tested using this LVA device on my Parrot AR.Drone 2.0 quad copter when using my MaxAmps 1300mAh battery pack and found it to be helpful in letting me know when my pack is getting low and I need to land my Drone. It is not always practical to keep an eye on the control device screen to watch the battery level which can drop very fast at the end. I prefer using my MaxAmps packs which give me longer flight time and much faster recharge times using my Hyperion charger (30 vs 90 minutes) over the supplied AR.Drone battery packs, but when using after market packs, I have noticed that the AR Drone Freeflight software does not accurately calculate the remaining battery usage left and can very quickly (within seconds) initiate autopilot to land or worse cutt off power to the motors and the Drone will fall out of the sky. So I have found this LVA device perfect to use which sounds a very loud alarm beeping sound to warn me when the battery pack is getting low to a preset voltage level that can be user adjusted by simply pressing a button on the LVA device. For my AR Drone with my 1300mAh packs I use a voltage setting of 3.4 which gives me about 30 seconds warning to give me time to get the Drone landed safely. The LVA device plugs into the battery packs balancing tap plug and is small enough to be tucked in next to the battery under both the indoor and outdoor Drone hulls. Even with the hulls on and the Drone in flight, I can still hear the LVA alarm signal from quite a distance away. I would recommend this device to anyone in need of knowing when their pack is getting low to prevent over discharge or crashing. Oh, and the LVA device can also be used as a stand alone voltage meter to let you know the status of your battery pack voltage levels. The folks at MaxAmps are great to work with and very helpful. Thanks MaxAmps!