Terms of Service

Last Updated: September 24, 2026

Overview

MultiBMS is an independent Bluetooth Low Energy battery-monitoring app for supported lithium battery management systems. By using MultiBMS, you agree to use it responsibly and only with battery equipment you own or are authorized to monitor.

Early-Access Software

Early-access builds may contain bugs, incomplete protocol support, changing features, and compatibility limits. Do not rely on MultiBMS as your only source of safety-critical battery information.

Battery Safety

MultiBMS provides read-only telemetry and alerts for convenience, whether over Bluetooth, your home gateway, or Pro remote access. It is not a replacement for a properly configured BMS, charger, fuses, disconnects, fire protection, manufacturer instructions, or professional electrical advice. Always follow the safety requirements for your battery chemistry, charger, vehicle, vessel, or energy-storage system.

Compatibility

Compatibility can vary by manufacturer, model, firmware, mobile operating system, and Bluetooth environment. Supported-device claims are best-effort and may change as protocol support improves.

MultiBMS Gateway and MultiBMS Pro

The MultiBMS Gateway is an ESP32 board you supply and flash yourself. It is read-only: it reads supported batteries and cannot send commands to them. Using the gateway with the app on your home network is free. The app does not require a subscription.

MultiBMS Pro is an optional auto-renewing subscription that adds remote access through our relay server: $1.99 per month per gateway ($1.99, $3.99 or $5.99 per month for one, two or three gateways), with a 7-day free trial. Payment is charged to your Apple or Google account, renews automatically each month unless cancelled at least 24 hours before the period ends, and can be managed or cancelled in your store account settings. Any unused part of a free trial is forfeited when you subscribe. Refunds are handled by Apple or Google under their policies. If a subscription ends, remote access stops; the app and your home-network gateway keep working.

Remote access depends on internet connections, your Wi-Fi, our server, and third-party services, and is provided on a best-effort basis without a guaranteed uptime. Readings may be delayed, missing or stale. Do not rely on Pro, alerts or remote readings as your only protection against battery faults. We may change or retire the service with reasonable notice. See the privacy policy for what the relay handles. Apple's standard end user license agreement applies to App Store purchases.

Permissions

MultiBMS requires Bluetooth permissions to scan for and communicate with BMS devices. Android may present nearby-device or location-related permission language for Bluetooth scanning, but MultiBMS does not use GPS location.

No Warranty

MultiBMS is provided "as is" without warranties of any kind. We do not guarantee uninterrupted operation, complete accuracy, compatibility with every BMS variant, or that alerts will always fire in every mobile OS state.

Limitation of Liability

To the maximum extent permitted by law, MultiBMS and its developer are not liable for damages, losses, equipment failure, battery damage, personal injury, data loss, or other consequences arising from use or inability to use the app.

Third-Party Trademarks

MultiBMS is independent and is not affiliated with, endorsed by, or sponsored by any battery management system manufacturer. Brand names are used only to describe compatibility with hardware sold under those names.

Contact

Questions about these terms can be sent to [email protected].