Warranty Coverage by Cell Model

*Whichever comes first — time period or cycle count.

Product Defect Warranty

For the duration specified in the table above from the date of purchase, if your battery pack fails due to defects in materials or workmanship — including inability to charge or discharge, BMS system failure, or abnormal swelling without physical impact — we will, at our sole discretion, repair the product, replace it with a new or equivalent unit, or provide a substantially equivalent solution.

Capacity Health Guarantee

This is our core promise, backed by Samsung's cell specifications. Lithium batteries are consumable components. Capacity naturally decreases with normal use over time. We guarantee that within the specified time period or cycle count for your cell model, your battery will retain at least 70% of its original rated capacity. Below 70%, you will feel a noticeable drop in runtime. We ensure you stay above that line within the guaranteed window.

How is capacity measured?

Warranty evaluation relies solely on the official State of Health (SOH) reading exported directly from your battery's integrated Bluetooth BMS. Third-party meter estimates, mileage calculations, or subjective range degradation do not qualify as technical evidence. Any capacity retention reading between 70% and 100% represents standard chemical aging and normal operating performance, not a product defect or warranty failure.

How is a cycle counted?

One full cycle equals cumulative discharge of 100% of the rated capacity. For example: use 30% today and recharge, then use 70% tomorrow and recharge — that counts as one cycle. All cycle data is accurately recorded by your battery's built-in Bluetooth BMS.

Understanding Samsung 50G and 50S

Samsung INR21700-50G — A high-capacity cell optimized for long cycle life. Under Samsung laboratory test conditions, the INR21700-50G cell is rated for excellent long-term cycle durability. Our 2-year / 600-cycle guarantee is set conservatively to reflect real-world usage conditions, which may differ from laboratory environments.

Samsung INR21700-50S — A high-power cell designed for demanding, high-drain applications. Engineered with advanced low-impedance electrode technology, our upgraded 2-year / 500-cycle guarantee reflects its proven endurance in performance use while ensuring you get the high discharge output you paid for.

How to Make a Warranty Claim

Our process uses BMS data as the definitive and binding basis for warranty assessment. Claims submitted without a complete, verifiable BMS diagnostic report cannot be processed or approved. Simple and transparent:

1. Contact us
   Email support@booant.com with your order number and a brief description of the issue.
   If the email link doesn't open, please manually copy and send to support@booant.com
2. Export your BMS diagnostic report
   We will guide you through connecting to your battery's Bluetooth BMS via our mobile app and exporting a diagnostic report. This report includes your cycle count, State of Health (SOH), and historical temperature data.
3. We review
   We typically respond within 2–3 business days with our assessment and whether your claim qualifies under warranty.
4. Replacement
   Once approved, we will, at our sole discretion, arrange a replacement shipment or an equivalent solution. Please do not return the old battery on your own. Lithium batteries are classified as dangerous goods and require special handling during transport. We will provide logistics instructions or safe disposal guidance depending on your situation.

Shipping Costs, Customs Duties, and Taxes

• We cover: Standard shipping for approved warranty replacement shipments from our warehouse to your original delivery address.
• You cover: Any customs duties, VAT, or import taxes that may arise during cross-border warranty service.

Why? Lithium battery shipping involves dangerous goods compliance and is more complex than standard parcels. This arrangement allows us to focus our resources on cell quality while keeping the warranty process straightforward and transparent for everyone.

What This Warranty Does Not Cover

• Normal capacity fade beyond the guaranteed time period or cycle count.
• Commercial, delivery, and fleet operations beyond cycle limits. Batteries utilized for commercial purposes, courier/delivery services, or fleet operations remain fully covered under warranty terms; however, the strict cycle count threshold governs coverage (whichever comes first). Once the maximum cycle count (600 cycles for 50G, 500 cycles for 50S) is logged by the BMS, warranty coverage expires regardless of calendar duration.
• Physical damage from impact, crushing, puncture, water immersion, or unauthorized disassembly or modification.
• High-temperature abuse — where BMS records show the battery was operated or stored in environments exceeding 60°C (140°F) for extended periods.
• Incompatible accessories. Use with non-approved chargers, controllers, or accessories that are not compatible with the product's specifications.
• Unauthorized applications. Use in racing, competitive events, life-support systems, or any application where battery failure could result in injury or property damage.
• DIY modifications. Any alteration, soldering, rewiring, or integration not explicitly authorized by Booant in writing.
• Force majeure events including fire, flood, earthquake, or other natural disasters.

Important Notes

• Original purchaser only. This warranty applies exclusively to the original purchaser via our official Shopify store and is non-transferable.
• Warranty period does not reset. Any replacement product continues under the original warranty period, calculated from the original purchase date.
• Returns and refunds. This warranty covers product quality issues. If you have simply changed your mind, please refer to our Return Policy.

Frequently Asked Questions