How to Safely Handle and Dispose of LiPo Batteries at Combat Robotics Events
If you’ve hosted or even attended a combat robotics event, you already know: LiPo batteries are everywhere. They're lightweight, powerful, and essential to the sport — but they also pose serious safety risks if damaged or mishandled.
As an event organizer, it's your responsibility to set the standard for safe battery disposal. Not only does this protect people and property, but it also builds trust in your organization. Here’s how we do it at RSL and how you can implement a similar system at your own events.
Why Proper LiPo Disposal Matters
LiPo (Lithium Polymer) batteries are known for their high energy density — and their volatility when damaged. A punctured or swollen battery can start a fire, leak hazardous material, or even explode. You don’t want that liability on your hands at a venue.
Step 1: On-Site Containment at the Event
What You Need:
- A galvanized steel bucket filled with dry sand
- Heavy gloves
- A clearly labeled collection zone near the pits or safety table
When a competitor’s battery gets damaged during a fight or while charging, it should immediately be placed in the steel bucket. The sand acts as a passive fire suppressant and stabilizer.
Common signs of a damaged LiPo:
- Puffing or swelling
- Punctures or torn shrink wrap
- Burn marks
- Chemical smells
- Detached wires or ejected during a match
Important: If you’re not sure whether a battery is damaged, treat it as if it is.
Step 2: Post-Event Saltwater Discharge
Once the event is over, you’ll likely have a handful of compromised batteries in your bucket. Here’s how we safely deal with them:
- Transfer them (carefully) into a saltwater discharge bucket — 5-gallon plastic bucket filled with salty water (1 cup of salt per gallon).
- Store the bucket outdoors, away from buildings or flammable materials.
- Let the batteries soak for 1–2 weeks to fully discharge.
- After they’ve sat for long enough, dispose of the saltwater responsibly (check local guidelines).
- Let the batteries dry completely before transporting them.
Step 3: Recycle Responsibly
Once the batteries are fully discharged and dry, do not throw them in the trash.
Take them to an authorized battery or e-waste recycling center in your area. Call ahead if you’re unsure they accept LiPos. Many municipalities offer drop-off days or designated bins for rechargeable batteries.
Pro Tip: Make Safety Part of the Culture
Consider adding a short “Battery Safety Briefing” to your pit meeting or rulebook. You can also post signage at your disposal station with these basics:
- What damaged batteries look like
- Where to drop them off
- Why this matters
Organizers who visibly prioritize safety attract more teams, more venues, and more community trust. It’s not just about compliance — it’s about professionalism.
Final Thoughts
Managing LiPo battery disposal might not be the flashiest part of running a combat robotics event, but it’s one of the most important. With just a few supplies and a simple procedure, you can reduce risk, improve safety, and show your teams that you take their well-being seriously.
Have questions or want to see how we run it at RSL events? Reach out — we're always happy to help other organizers level up their game.