Live BMS talks straight to your LiFePO4 packs over Bluetooth — charge, volts, amps, temperature, per-cell health — and tells you in plain English how long you've got left.
Manufacturer apps show one battery at a time and speak in raw numbers. Live BMS puts the whole bank on one dashboard and answers the question you actually have: can I make it back?
All your batteries live at once. Group the packs that are wired together into a bank and see one combined charge, one power draw, one runtime.
A running estimate at the rate you're actually using right now — not a percentage you have to translate in your head.
Power × speed becomes distance. A live range ring, a turn-around ring, and a destination check — for trolling motors, golf carts and e-bikes.
It learns your gear, then speaks up: prop drag, a weak cell, a charger that isn't finishing, phantom drain, health fading over the season.
Charge ring, hours left, live watts — and the output switch — on your wrist. Alerts mirror over automatically.
Per-cell voltage bars and imbalance, charge/voltage/current charts, and plain-language alerts for low charge, high temp and drifting cells.
Real screens from the app running on real batteries.
Prove it works with your hardware before you pay a cent.
Everything the app can do, forever. No subscription.
Bluetooth only reaches so far. The Link is a small ESP32 relay you leave with the batteries: it holds the connection, and pushes readings to your phone wherever you are — the boat in storage, the RV in the driveway, the cabin off-grid.
Power is the whole install. 12V in, or a USB brick. Nothing wired to the batteries — it reads them over Bluetooth, same as your phone.
Set up from the app. It finds the Link, you type your Wi-Fi password once, it discovers your batteries and shows them live while you name them.
Same card, two pipes. At the lake it runs on direct Bluetooth; away from the boat the same battery card keeps updating through the Link.
Helm Display. A 4.3" touchscreen version for the dash that relays and shows the whole bank at the helm.
Prototypes are running today on the boat. Pricing and ship dates aren't set yet.
See both devices →Matchbox-sized ESP32 you hide near the batteries. Cheap, silent, and meant for a boat in storage or an RV in the driveway. Runs on 12V or a USB brick.
Mounts at the dash. Shows the whole bank on its own screen and relays to the cloud at the same time. 12V straight in — no pins to wire.
Same firmware core, same driver registry as the app, over-the-air updates so new BMS families arrive without a cable.
If it's a LiTime, Power Queen or Redodo LiFePO4 pack, or a battery running a common JBD/Xiaoxiang, JK-BMS or Daly board, almost certainly. Junctek and BM6 shunts are supported too. The free version exists exactly so you can check with your own hardware before paying — install it, add one battery, and see live numbers in under a minute.
No. The app talks directly to your batteries over Bluetooth and stores history on the phone. There are no accounts, no ads, and nothing is uploaded. The optional Live BMS Link hardware is what adds remote access later, and only for the batteries you point it at.
Not today — Live BMS is iPhone and Apple Watch. If enough people on the hardware list want Android, that's the strongest signal for building it, so say so in the setup box above.
Yes, on batteries whose BMS supports it — per battery, or a master switch for all of them. It's behind a confirmation gate so you can't kill your own trolling motor with a stray tap.
Not set yet, and I'd rather say that than invent a number. It's a small ESP32 board, a case and firmware — the goal is to price it like an accessory, not a marine instrument. Full status on both devices here.
Live BMS