# Universal Load Controller — Controller for DL24/DL24P

> Controller for DL24/DL24P (iPhone/iPad app by Hendrik Kaiser.)

- Source: https://appshunter.io/ios/app/universal-load-controller/id6760568473 (this page in markdown: same URL + `.md`)
- Developer: [Hendrik Kaiser](https://appshunter.io/developer/1883114402)
- Category: Utilities, Developer Tools
- Price: $5.99
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Polish, European Portuguese, Russian, Chinese (Simplified, China), European Spanish and 1 more
- Released: 2026-03-20
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/universal-load-controller/id6760568473/reviews.md

## What is Universal Load Controller?

Universal Load Controller — Professional Battery Testing

Control your Atorch DL24 / DL24P electronic load from your iPhone or iPad for precise battery capacity testing, logging and analysis.

BEFORE YOU BUY — COMPATIBILITY

iOS cannot use classic Bluetooth SPP, which is what the stock DL24/DL24P Bluetooth module uses. Please check the following list first.

WORKS FULLY — DL24 firmware v5.1 (+ BLE serial adapter)
• Direct setpoints: discharge current and cutoff voltage sent from the app
• Start / stop of the load from the app
• Read-back of the applied settings
• Automated multi-phase test cycles (discharge, rest, ramp)
• Live values, charts, capacity/energy logging, CSV and PDF export

WORKS WITH LIMITS — DL24 firmware v1.1 (legacy)
• Firmware v1.1 accepts button emulation only: SETUP, OK/On-Off, +/-
• It does NOT accept direct commands for exact current or cutoff values
• Therefore automated app cycles are blocked on v1.1 by design — the app tells you instead of applying a wrong setpoint to your cell
• Recommended use: set current and cutoff manually on the DL24, then use the app in Manual mode for live values, timing, logging, charts and export
• Select "Firmware v1.1" in Settings, Protocol, so the app uses the matching command set

DOES NOT WORK
• Stock classic-Bluetooth (SPP) module: iOS does not allow regular apps to use SPP. A BLE serial module or BLE-to-serial bridge is required.
• USB / HID connection to the load (iOS has no equivalent of the vendor PC app)
• CR / CP / CV modes: the Atorch protocol exposes only constant current (CC). Other modes can neither be read nor set — by any app, on any firmware.
• iOS 16 or older — this app requires iOS 17.0 or newer.

REQUIRED HARDWARE FOR A REAL CONNECTION
• Atorch DL24 / DL24P electronic load, plus one of:
- a BLE serial module (HM-10 or compatible, service FFE0 / characteristic FFE1) in place of the classic Bluetooth module, or
- an external BLE-to-serial bridge exposing FFE0/FFE1 or the Nordic UART Service (6E400001-B5A3-F393-E0A9-E50E24DCCA9E)
• Related Atorch meters advertising as DL24P, DL24_BLE, DL24, AT24, UD24, UD18 or DT24 are detected during the scan, but only the DL24 load family is supported for control.

NO HARDWARE? Simulation Mode runs the complete app with a realistic simulated discharge, so you can evaluate every screen before buying an adapter.

FEATURES

BATTERY TESTING
• Constant-current discharge with adjustable cutoff voltage
• Real-time voltage, current, power and temperature
• Capacity (mAh) and energy (Wh) measurement
• Time and capacity limits

LIVE DATA
• Real-time discharge curves with zoom and pan
• Voltage, current and capacity plots
• Live Activity on the Lock Screen, Always-On Display and Dynamic Island
• Home Screen widgets for the running test
• Background Bluetooth so a test keeps logging

TEST CYCLES (firmware v5.1)
• Presets for LiPo, Li-Ion, LiFePO4 and NiMH
• Custom cycles with discharge, rest and ramp phases

EXPORT
• CSV export of the full measurement log
• PDF test report with the run summary
• Share sheet support for both

Perfect for battery capacity verification, cell matching and sorting, quality control, hobby electronics and lab use.

SAFETY: You are testing real cells at real currents. Always verify current and cutoff values on the device itself, use protected cells or a current-limited bench setup, keep physical access to the load's stop control, and never leave a running test unattended.

Universal Load Controller is an independent app. It is not affiliated with, endorsed by, or supported by Atorch.


## Version history (last 5 releases)

### 1.0.21 — 2026-08-11

• First-run tutorial: a short guided introduction the first time you open the app, repeatable any time from Settings.
• New offline User Guide in Settings, covering how to connect a device, run a discharge test, work with presets and cycles, read results and export them, plus safety and troubleshooting.
• The guide states clearly which DL24 firmware does what: v5.1 accepts automatic current and cutoff setpoints and complete test cycles, while v1.1 only supports button-style remote control.
• Notification access is no longer requested at launch; the app now reflects the actual system permission state.
• Tutorial and User Guide are available in all 11 app languages.

### 1.0.20 — 2026-07-01

Added an App Store rating prompt after successful tests and exports
Improved export workflow
Minor stability improvements and bug fixes

### 1.0.19 — 2026-06-16

Improved accessibility: live measurement values now scale with your system text size and work with VoiceOver
Better iPad layout with a centered, readable column
Connection error messages are now fully localized in all 11 languages
Stability and reliability improvements under the hood

### 1.0.18 — 2026-06-12

- Added improved test log scrolling: the log now follows new entries automatically while still allowing manual scrolling.
- Firmware v1.1 now clearly explains manual setup with live monitoring, timing and logging support.
- Improved BLE compatibility for DL24 devices using the official FFE0/FFE1 BLE serial profile.
- Improved connection status feedback and start-test stability handling.

### 1.0.1 — 2026-05-27

• Added live language switching and expanded app localization, including Polish and Ukrainian.
• Improved the cycle editor with clearer presets, descriptions, and multi-step cycle handling.
• Enhanced PDF reports with localized report text, test context, measured summaries, and cycle details.
• Added clearer firmware guidance for older firmware and firmware v5.2+ control/readback features.
• Improved the Live Activity / Always-On Display widget for better readability during tests.

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## More apps by Hendrik Kaiser

- [DocuFlow: AI Document Manager](https://appshunter.io/ios/app/docuflow-ai-document-manager/id6760195594)
- [SnailAlbum](https://appshunter.io/ios/app/snailalbum/id6790789365)

All apps by Hendrik Kaiser: https://appshunter.io/developer/1883114402

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*