1. XTAR vs Alkaline vs NiMH

Why mWh instead of mAh?

XTAR 1.5V Li-ion batteries use a built-in DC-DC buck converter to step down the internal 3.6V Li-ion cell to a stable 1.5V output. Because the output voltage differs from NiMH (1.2V) and alkaline (1.5V but continuously dropping), mWh (milliwatt-hours) is the scientifically correct unit for comparing total energy.

Conclusion: In measured energy density, the XTAR CLR 4300 ranks in the top tier of all tested AA batteries regardless of chemistry, delivering 3,812 mWh. Source: akkutests.de

2. Capacity Tests & Cell-to-Cell Consistency

Independent measurements show how XTAR 1.5V Li-ion batteries perform in real-world capacity tests, including cell-to-cell consistency and capacity behavior across different discharge currents. Results below are grouped by model.

AA CLR 4300 (2,700 mAh / 4,300 mWh)

Gough Lui tested two CLR 4300 cells across discharge currents from 0.25A to 2A. Capacity was highest around the 0.5A range and gradually decreased as the load increased, showing how usable capacity changes under different power demands.

AA LR 3000 USB-C (3,000 mAh)

The LR 3000 uses a linear discharge curve (similar to alkaline natural decay, but with average voltage always higher than both alkaline and NiMH). At 0.25A light load, measured capacity reached 3,195 mAh—6.5% above rated—making it the highest-capacity AA model in XTAR's lineup.

AA 4150 (2,500 mAh / 4,150 mWh)

Four AA 4150 cells were tested at approximately 0.25A, delivering 2,352–2,422 mAh with an average measured capacity of 2,392 mAh—about 96% of the rated 2,500 mAh capacity. The four samples also showed relatively close capacity results.Its signature trait is a 1.5V plateau followed by a step-down to 1.1V, giving devices a clear low-battery warning.

AA 3960 THL (2,500 mAh / 3,960 mWh)

The 3960 THL is the industry's first AA Li-ion battery with touch-based charge-level indication. Admiral134's professional battery analyser tests show capacity near rated values at 0.5A, and stable output of ~1,970 mAh even at 3A high drain, with good BMS thermal control.

AA 4100 USB-C (2,450 mAh / 4,100 mWh)

The 4100 USB-C is measured ~2441 mAh at 0.5A discharge, close to the 2450 mAh rating; ~1890 mAh at 2A high load. It supports USB-C direct charging, and can also be charged with compatible XTAR chargers such as the L4 Pro, VX4 V2, L8.

Source: Kerry Wong

AAA 1620 (1,000 mAh / 1,620 mWh)

The AAA 1620 measured approximately 976 mAh at 0.2C and 994 mAh at 0.5A, both close to its 1,000 mAh rating. In a four-cell VX4 test, capacities of 978 / 963 / 954 / 968 mAh —demonstrating good consistency among AAA batteries.

3. Discharge Curves & Voltage Stability

Third-party reviewers test discharge curves to verify three things: voltage stability (does the device get steady power throughout its runtime?), fuel-gauge compatibility (will low-battery warnings work correctly?), and energy utilisation (the longer the constant-voltage plateau, the longer the device runs at peak performance).

Five Categories of 1.5V Li-ion Discharge Curves

German testing station akkutests.de classifies 1.5V Li-ion batteries into five behavioural categories:

Conclusion: akkutests.de rates the CLR 4300 as combining "the best characteristics of 1.5V batteries currently available"—two-thirds of capacity at a stable 1.5V, followed by a linear decline to 1.0V, giving both sustained performance and a low-battery warning. Source: akkutests.de

Measured Curve Characteristics by Model

CLR 4300 / Smart Series (1.5V Constant + Linear Discharge)

The CLR 4300 maintains approximately 1.5V through most of its discharge, then gradually declines to around 1.05V near depletion instead of dropping abruptly. This allows compatible devices to detect the falling voltage and provide a low-battery indication before shutdown.

Source: Sven Greiner

LR 3000 / Longlife Series (Linear Discharge)

Full-range linear decline, similar to alkaline natural decay but with average voltage always higher than both NiMH and alkaline. Ideal for devices that rely on voltage-sensing fuel gauges, such as legacy mice, game controllers and Tascam recorders.

Source: akkutests.de

AA 4150 / HighPower Series (1.5V Constant + Low-Power Indicator)

The battery maintains a stable 1.5V output through most of the discharge, then steps down to approximately 1.1V before depletion, providing a clear low-power indication for compatible devices.

Source: Sven Greiner

4. High-Drain Performance & Thermal Control

Heat in 1.5V Li-ion batteries originates primarily from the DC-DC buck chip, not the cell itself. Third-party tests show that XTAR batteries maintain safe surface temperatures under normal loads (<2A), though chip temperatures rise significantly near the current limit.

Conclusion: goughlui's thermal imaging shows the LR 3000 chip surface nearing 80°C at 2.5A discharge, while the outer shell remains much cooler—confirming that chip thermal design is the critical factor, and shell temperature does not reflect internal chip temperature. Under normal loads, the entire range operates safely. Source: goughlui

Maximum Discharge Current

• CLR 4300: Rated 2.5A, tested to 3.6A burst before protection triggers. Source: Sven Greiner
• LR 3000: Rated 2.5A, tested to 3A burst. Source: akkutests.de
• 3960 THL: Max continuous 3A; exceeding triggers over-current protection. Source: Admiral134

5. Cycle Life & Long-Term Durability

LR 3000 — 50-Cycle Test

Australian reviewer goughlui conducted 50 C/5 charge/discharge cycles on the LR 3000. The results show virtually no capacity degradation:

Conclusion: After 50 cycles capacity shows virtually no decay and no downward trend. Linear-model extrapolation estimates a cycle life of approximately 1,714 cycles—better than the official 1,200-cycle rating.

Long-Term Durability: Performance After One Year

Multiple users and reviewers have provided long-term feedback, demonstrating that XTAR batteries maintain stable capacity output after extended use:

• Robert Hamm (USA): High-frequency use for 6–7 weeks, 40–50 charge cycles: "still darn decent." Compared to old Energizer NiMH which had degraded severely. Source: Robert Hamm
• Stones RC Channel (Australia): AA batteries still in use after one year: "no noticeable performance degradation." Source: Stones RC Channel
• Fototrappole e Fototrappolaggio (Italy): CLR 4300 used for over a year, surviving winter conditions: "every time I check the camera, the batteries are full." Source: Fototrappole
• TechLineHD: AA 3300 after one year of use still measured ~1,900+ mAh (rated 2,000 mAh), demonstrating excellent capacity retention over time. Source: TechLineHD

6. Low-Temperature Performance

XTAR 1.5V Li-ion batteries perform significantly better than alkaline and NiMH in cold environments. Third-party tests cover extremes from −15°C down to −35°C.

Lab Low-Temperature Tests

vs Alkaline & NiMH in the Cold

Tsula's Big Adventures conducted a field test at −2°C on a mountain night:

Extreme Cold: −35°C

Italian reviewer Fototrappole e Fototrappolaggio tested the CLR 4300 at −35°C: the battery continued normal operation, capturing 1,000 thirty-second videos on an infrared trail camera. Source: Fototrappole

Field Validation

7. Self-Discharge & Long-Term Storage

XTAR 1.5V Li-ion batteries exhibit far lower self-discharge than traditional NiMH and feature a shutdown protection mechanism ideal for long-term storage.

Shutdown protection: When the internal Li-ion cell voltage drops below 2.8V, the circuit forcibly shuts down and quiescent current falls to <4 µA, preventing the cell from being "starved to death" (deep over-discharge damage). The battery returns to normal operation after recharging. Source: goughlui

8. Output Ripple & EMI Compatibility

The built-in DC-DC buck converter in 1.5V Li-ion batteries generates switching ripple. Third-party tests show that XTAR batteries maintain excellent ripple control under high load and produce no audible interference in professional audio equipment.

Conclusion: akkuvergleichstest.de states that the CLR 4300 offers "the best balance of efficiency, stability and low electromagnetic interference in the medium load range." For audio recording equipment, high-load ripple remains extremely low (14–17 mVpp), making these batteries safe for professional use. Source: akkuvergleichstest.de

Audio Equipment: Zero-Interference Field Tests

• Justin Hatt (USA): Using XTAR batteries in a Roland AC33 guitar amp system: "No noise whatsoever, no effect delay, no audio fluctuation—sound is crystal clear and stable." Source: Justin Hatt
• Ross Mackinlay (UK): Professional audio equipment test comparing NiMH vs XTAR: "From an audio perspective, both batteries performed exactly as expected—another testament to carefully designed power circuits and filters." Source: Ross Mackinlay test report

9. Charging Performance

XTAR 1.5V Li-ion batteries support both dedicated battery chargers and USB-C direct charging, with charging efficiency significantly better than traditional NiMH.

Charging Time Benchmarks

Dedicated chargers use constant-current charging, typically 450–500 mA per slot. Measured charge times for each model:

Conclusion: At the standard 500 mA current, the entire XTAR 1.5V Li-ion range charges in 2.5–3.5 hours—far faster than the 6–8 hours required by traditional NiMH. The L8's 8-slot independent-channel design supports mixed charging, ideal for volume users. Source: xgadget.de

USB-C Direct-Charging Times

USB-C direct charging is a standout feature of the LR 3000 and 4100 USB-C, allowing top-up from common USB power sources without a dedicated charger.

Charger Compatibility Matrix

XTAR 1.5V Li-ion batteries contain independent charge-management ICs and must use chargers that support the 1.5V Li-ion protocol. Standard NiMH chargers cannot recognise the battery type and may fail to charge or under-charge.

Third-Party Charger Compatibility

10. Safety Design & Protection Mechanisms

XTAR 1.5V Li-ion battery safety lies not only in the cell itself, but in the multi-layer protection built into the BMS (Battery Management System). Third-party teardowns and stress tests confirm these protections work as designed.

Internal Build Quality & Layout

Gough Lui's teardown of the CLR 4300 provides a detailed look at the internal construction of XTAR's 1.5V Li-ion battery design:

• Double insulation: The internal Li-ion cell uses multiple insulating layers to reduce the risk of unintended electrical contact.
• Spot-welded connections: Both positive and negative cell connections are spot-welded rather than relying on loose spring contacts, providing a secure electrical connection.
• Plastic spacing ring: A plastic spacer helps locate and separate the converter PCB from the internal cell.
• Additional PCB insulation: Insulating washers and barley-paper insulation are used around the converter circuitry to reduce the possibility of internal short circuits.

Overall, the teardown shows multiple mechanical and electrical isolation measures around the internal cell and converter PCB, with particular attention to preventing unintended contact between conductive components.

Source: Gough Lui

BMS Protection Functions & Verified Trigger Tests

Reviewers verified every XTAR BMS protection function through stress testing:

Conclusion: XTAR's BMS uses a "graded protection" strategy: current overloads trigger current limiting before cut-off; temperature rises trigger power reduction before shutdown; deep discharge enters micro-current hibernation rather than full cut-off. This design protects the cell while maximising the chance of recovery. Source: Admiral134 / goughlui

Over-Current Protection: Verified

• Admiral134 tests 3960 THL: Max continuous 3A; exceeding triggers over-current protection. Battery is undamaged and resumes normal operation after recovery. Source: Admiral134
• Kerry Wong tests 4100 USB-C: Single-cell max 3A before protection; two cells in parallel deliver 6A combined, useful for temporary high-power demand. Source: Kerry Wong
• Sven Greiner tests CLR 4300: Rated 2.5A, tested to 3.6A burst before protection triggers, no damage. Source: Sven Greiner

11. Real-World Application Index

Every scenario below comes from independent third-party testing. Each entry shows a one-line conclusion with key data; click through to the full application page on xtar.cc for details.

Professional Audio

Paul Virostek tested the XTAR 4150 on a Zoom F3 recorder and found it lasted 2 hours 21 minutes longer than Eneloop Pro—a +57% improvement in recording time.

Trail Cameras

Fabien Piege Photo deployed a GardePro trail camera in the wild at −20°C for several months using CLR 4300 batteries. The battery indicator remained at 100% throughout the entire period.

Thermal & Night Vision

In real-device testing, an ADNV G14SE night vision monocular ran for over 16 hours on an XTAR 18650 4000mAh battery, compared with just over 5 hours using a CR123 battery.

Medical

Independent testing of XTAR 1.5V AA batteries measured 1,740–1,750 mAh across four samples against an 1,800mAh rating, demonstrating consistent capacity for voltage-sensitive devices such as electronic blood pressure monitors.

Flashlights

jon_slider tested CLR 4300 and LR 3000 in a Zebralight SC53c N flashlight and measured an extremely low flicker index, with beam stability outperforming Eneloop.

RC Models

The RadioComandati's tested XTAR on a Mini-Z drift car and noted that the full-range constant-voltage output made the "performance difference very obvious" compared to NiMH.

Smart Home

Mark's Tech Vlogs installed XTAR batteries in a Sure Flap smart pet door and recorded 5 months of continuous use with the charge level still reading between 80–100%.

Source Index