Battery Pal
For Builders Who Are Done Cutting Corners.
Add battery power to any embedded project in minutes, with charging, protection, and regulated output built in.
Battery Power Should Be Easy.
Every builder hits the same walls.
It's Never Just a Battery
You sat down to build your project. Three weeks later you're reading charger IC datasheets and laying out protection circuits. The battery subsystem has become the project.
Lithium Batteries Don't Forgive
A shorted output, a charge cycle in a hot car, or an over-discharge over the weekend can all cause permanent damage. Without proper protection, lithium batteries fail in ways you can't undo.
Nothing Does the Whole Job
The $0.30 modules have no regulated output and no real protection, while the $20 boards top out at 1A over Micro-USB with no dedicated protection IC. The options are either cheap and dangerous or expensive and incomplete.
Meet Battery Pal
Battery Pal is one module that handles USB-C PD charging up to 3A, dedicated battery protection with temperature profiling, and a regulated 3.3V or 5V output. It's everything a single-cell lithium project needs.
Every parameter is configured with labeled solder jumpers on the board, so there's no firmware to flash, no I2C registers to set, and no driver to write. It works from the moment you apply power.
Battery Pal is designed for 3.7V nominal (4.2V max) single-cell lithium batteries only. Performance depends on the connected battery cell.
Everything Your Project Needs to Run From a Battery
USB-C in, 3.3V or 5V out, and your battery is protected.
Everything is configured with labeled solder jumpers, not code.
USB-C Power Delivery Input
Onboard PD controller auto-negotiates 5V or 9V. Also works with any 5V USB-A charger via A-to-C cable.
5V / 9V PD •Any 5V USB source
Direct Vusb Input & D+/D- Passthrough
Use USB-C on the bench, then switch to your own 4.5 to 13.5V rail in production. D+/D- lines pass through to castellated pads so you can charge and transfer data over a single cable.
4.5–13.5V direct input •22V abs max •Data passthrough
Up to 3A, 4.2V Smart Charger
Charge current selectable from 0.5A to 3A via solder jumpers. Optional 4.1V jumper for longer cycle life. 10kΩ NTC thermistor support with bypass jumper.
0.5–3A selectable •4.1V option •NTC support + bypass
Buck-Boost Regulated Output
The output defaults to 5V, and you can solder the 3V3 jumper for 3.3V. It stays stable from full charge down to the 2.8V cutoff with no dropout or glitches, using every drop of battery capacity.
Up to 1.5A output •<20 mV ripple •2 MHz switching
Ultra-Low System Idle Draw
A 1000 mAh battery lasts over 5 years at idle, and you can disable the regulator via the Ren pin for deep shutdown.
Years of standby •Ren pin disable •Deep shutdown mode
Breadboard to Production
Use 2.54mm headers for prototyping and castellated SMT pads for production reflow, all on the same board from bench to product. JST PH and XH connectors are included, and a JST 1.25mm adapter will be available at launch.
JST PH / XH •1.25mm adapter •4x M2 •Castellated edges
Advanced users: solder the PO jumper to bypass the onboard protection IC for batteries with built-in protection circuitry.
Board will get warm under load or while charging. This is normal.
Battery Pal is in active development. Specifications may change before launch.
Interested? Get notified when we launch.
Built For Your Next Project
Battery Pal works with anything that needs a single-cell lithium battery, clean power, and proper protection.
IoT Sensors & Nodes
Pair an ESP32 or nRF with environmental sensors and let the ultra-low idle draw keep your remote sensor running for years between charges.
Portable Instruments
Power handheld meters, data loggers, and test equipment with a stable 3.3V or 5V output regardless of battery state, and charge via USB-C between uses.
Robotics
Power your control board, sensors, and small motor drivers with up to 1.5A of regulated output, or draw up to ~3.5A directly from Vsys for higher-current loads.
Wearables
The JEITA temperature profile manages the charge rate based on ambient conditions, and low quiescent current extends battery life between charges.
Solar-Powered Systems
Connect a regulated 4.5 to 13.5V source to the Vusb pin and use a solar charge controller to keep the voltage within range, with no USB connector required.
Hardware Products
Prototype on a breadboard and ship with the same module soldered to your PCB. The castellated edges reflow cleanly in production, so there's no power redesign between revisions.
Be First in Line.
Battery Pal is in active development.
Prototype boards are in production now.
Have a question? Contact us. We actually respond.