Lithium battery safety, made simple
Never forget to check your lithium batteries.
LiPo and li-ion batteries degrade quietly in storage, and a forgotten pack can turn into a fire hazard or a ruined investment. Battery Warden tracks every battery you own and reminds you exactly when to check it.
No password needed. Free for up to 10 batteries, forever.
A real fire risk
Swollen, damaged, or over-discharged lithium cells can ignite. Drones, e-bikes, and camera rigs left in storage are the most common culprits, and the damage is easy to prevent, easy to forget.
A real financial loss
A ruined cinema battery, a bricked e-bike pack, a fleet of drone batteries gone bad: degradation you didn't catch in time is money you don't get back.
A five-minute fix
Add your batteries once. Battery Warden works out a check-in schedule per device type and reminds you on the channels you actually use.
Everything a battery fleet needs
From a single power bank in a drawer to a hundred-pack FPV fleet.
Smart check-in scheduling
Every battery type gets a suggested interval: 30 days for an FPV pack, 6 months for a laptop in storage. Adjust anytime.
Reminders where you'll see them
Email for everyone, plus web push, calendar sync, and SMS on paid plans, so a check-in never gets buried.
QR labels
Print a code for each battery and stick it on the case. Scan with your phone to pull up its log and check in on the spot.
Detailed check-in logs
Track voltage, cycle count, internal resistance, notes, and photos over time: a real maintenance history for every device.
Battery safety guide
Step-by-step guidance for spotting swelling and damage, plus what to do next if a battery is flagged puffed.
CSV export
Export full check-in history per battery or date range, ready for insurance claims or fleet compliance records.
Built for how you actually use batteries
Pick a preset when you add a battery and Battery Warden suggests the interval and storage guidance, no guessing.
FPV / RC pack
Check every 30 days
Store at ~3.8V/cell. Never leave fully charged in storage.
E-bike / e-scooter pack
Check every 60 days
Keep at 40–60% charge for long storage.
Camera V-mount / cine battery
Check every 45 days
High-value packs: track cycle count and internal resistance.
Power bank
Check every 90 days
Top up to ~50% every few months.
Solar / backup pack
Check every 120 days
Tolerant chemistry; store ~50% and keep terminals clean.
Laptop / device in storage
Check every 180 days
Charge to ~50% before shelving.
Up and running in a few minutes
Add your batteries
Pick a type preset - the check interval and storage guidance are filled in for you.
Get reminded on schedule
Email, push, calendar, or SMS - whichever channels fit your plan and your habits.
Log the check-in
Scan the QR code, note the voltage and condition, snap a photo. Done in seconds.
Simple plans, cancel anytime
Free forever for everyday use. Upgrade when you're managing a fleet.
Early Adopter Phase Every feature is free for everyone right now; pricing below shows what's coming after early access.
Hobbyist
- Unlimited batteries
- Web push notifications
- Calendar (.ics) feed
- QR labels
Business
- Everything in Hobbyist
- SMS reminders
- CSV export
- Multi-user (coming soon)
Know what a healthy battery looks like
Every account gets access to our battery safety guide: clear guidance for spotting early, moderate, and severe swelling, plus per-chemistry storage guidance.
If a check-in gets flagged Puffed, Battery Warden immediately walks you through safe isolation, discharge, and where to find nearby e-waste disposal.
See the safety guideNormal shape, stable voltage, no damage.
Slight swelling or voltage drift; check again soon.
Visible swelling or damage; isolate and follow the safety flow.
Taken out of service; kept in your log for reference.
Frequently asked questions
How do I sign in?
Battery Warden uses passwordless magic-link email: enter your email and we send you a one-time sign-in link. No password to create or remember.
What happens on the free plan?
You can track up to 10 batteries with email reminders and full access to the safety guides, free forever. Upgrade any time you need more batteries or more reminder channels.
Can I export my data?
Yes, you can export your account data at any time, and Business plans include CSV export of check-in history per battery or date range.
Can I cancel anytime?
Yes. Plans are month-to-month or annual with no lock-in; cancel from your account settings whenever you like.
Is my data private?
Your battery logs and photos are private to your account. See our Privacy Policy for details.