How to Use a LiFePO4 Charger for CR2 & CR123A
By Professor Optiken - Zieloptiken, Ferngläser & Reflexvisiere | Published: 2026-10-19
Category: How-to Guides
Learn how to safely charge rechargeable CR2 and CR123A LiFePO4 batteries using a dedicated charger, with step-by-step instructions and common pitfalls to avoid.
Quick Answer
Use a dedicated LiFePO4 charger like the Professor Optiken 2-fach or 4-fach model to safely charge rechargeable CR2 and CR123A batteries in 0.5 to 1.5 hours, with independent channels for each battery.
Why a Dedicated LiFePO4 Charger Matters
CR2 and CR123A batteries come in both primary (non-rechargeable) and rechargeable chemistries. LiFePO4 (lithium iron phosphate) cells require a specific charging profile—using a standard lithium-ion charger can damage them or create a safety risk. A dedicated LiFePO4 charger ensures the correct voltage and current limits, giving you reliable performance and longer battery life.
The Professor Optiken chargers are designed exclusively for LiFePO4 cells, so you can plug in your rechargeable CR2 or CR123A batteries without guesswork.
Common Charging Mistakes to Avoid
One frequent error is mixing battery chemistries in the same charger. LiFePO4 and standard Li-ion cells have different charging voltages—never charge them together. Another is over-discharging: LiFePO4 batteries can be damaged if drained below 2.0V per cell. Finally, always check that your batteries are actually rechargeable—many CR2 and CR123A cells are disposable and cannot be charged at all.
Step-by-Step: Charging Your CR2 or CR123A LiFePO4 Batteries
- Check Battery Type: Confirm your batteries are labeled "rechargeable" and specifically "LiFePO4." Non-rechargeable CR2/CR123A cells will not work and can be dangerous if inserted into a charger. If the battery says "Do not recharge," do not attempt to charge it.
- Insert Batteries Correctly: Place each battery into an independent channel of the Professor Optiken charger, observing polarity (+ and -). The charger's display will show the current charge status for each slot. Mixing polarity can damage the battery or charger—double-check before closing the lid.
- Select Charging Mode (if applicable): The Professor Optiken charger automatically detects LiFePO4 chemistry and applies the correct profile. No manual mode selection is needed—just plug it in. Never force a different charging mode; the charger handles it automatically.
- Monitor Charge Progress: The LED or display on the charger shows each channel's status. Charging typically takes 0.5 to 1.5 hours depending on battery capacity. When the indicator shows full, remove the batteries promptly. Leaving fully charged batteries in the charger for extended periods can reduce their lifespan.
- Store Charged Batteries Safely: Remove charged LiFePO4 cells and store them in a cool, dry place away from direct sunlight and metal objects. Use a dedicated battery case to prevent short circuits. Never store loose batteries in a pocket or drawer with keys or coins.
Chargers That Make It Easy
- Professor Optiken Ladegerät für CR2 und CR123A Akkus (LiFePO4) - 2-fach: Compact 2-fach charger for CR2 and CR123A LiFePO4 cells with individual channel control and charge status display. You can charge one or two batteries independently and see the charge level at a glance, avoiding over- or under-charging.
Professor Optiken Ladegerät für CR2 und CR123A Akkus (LiFePO4) - 2-fach - Professor Optiken Ladegerät für CR2 und CR123A Akkus (LiFePO4) - 4-fach: 4-fach version offers the same fast charging (0.5–1.5 hours) and per-channel control for up to four LiFePO4 cells. Ideal if you use multiple devices that rely on CR2 or CR123A batteries—charge a full set at once without waiting.
Professor Optiken Ladegerät für CR2 und CR123A Akkus (LiFePO4) - 4-fach
