Power Products Alpha C-25 – 25-Amp Aircraft Battery Charger
The Alpha C-25 Charger is a self-contained unit for charging rechargeable batteries. It has been designed to charge one or two batteries of the same voltage rating simultaneously, to a combined maximum of 25 amperes. At 40 lbs and 15" by 5.75" (38.1 by 14.6 cm), the C-25 takes up minimal space and can be easily moved, adding flexibility to the work environment. The charger's height and depth are the same as those of Power Products’ discharge tester, Beta D-50, and it has the same general appearance. Therefore, two adjacent units comprise a charger/discharger that can service from one to three batteries simultaneously, whether lead-acid or nickel-cadmium.
The Alpha C-25 supports charging at both constant potential and constant current, providing flexibility in selecting the charging method. The C-25 charger has an adjustable charge current from 0 to 25 amperes in the CP (Constant Potential) mode. The end-of-voltage settings should be 14.3 for 12 Volt batteries and 28.5 for 24 Volt batteries. Panel trim pots allow the user to adjust voltage if required. In CC (Constant Current) mode, there is no voltage adjustment. The maximum voltage is approximately 37 volts. Two digital panel meters allow viewing of charge current and voltage. They can be switched to view either of the two batteries being charged. A digital electronic timer displays elapsed time and can be set to a fixed duration charge period.
The Alpha C-25's flexible settings make it usable with a wide variety of batteries and voltages. The unit efficiently charges Lead Acid batteries of 12 or 24 volts, as well as Nickel Cadmium batteries of a single cell to 24 volts.
This unit can be used in conjunction with the Power Products Beta D-50 battery discharge analyzer.
Specifications
- Charge current: 0 to 25 amperes total
- AC input: 12A@115V, 6A@230V 50/60 Hz
- DC output cables – 3 sets: Elcon, alligator clips, rings
- Charge voltage/current accuracy: +/- 1%
- NSN: 6130-01-462-6335; 6130-21-258-4429 Canada
- Dimensions: 6" L x 14" H x 15" D
- Weight: 45 lbs
Features
- Isolated charge – one or two batteries. Charges all 12 and 24-volt lead-acid batteries and 1 to 22-cell NiCads
- Current adjustable from 0 to 25 amps
- True constant current (Cl) for NiCad batteries or constant potential (CP) for lead-acid batteries
- Digital ammeter and voltmeter read charge current and voltage for either battery
- Selectable charge time from 1 to 999 minutes with digital elapsed time
- Operates on either 115V or 230V AC
Operation
- Select 12 or 24V for lead-acid or constant current for NiCad charge/topping or lead-acid conditioning
- Set charge time
- Set charge current
Controls
- Three-position selector: 12V Lead (CP), 24V Lead (CP), or NiCad (CI)
- Current adjust - 5 turn: 0 to 25 amperes
- Settable digital charge timer, 1 to 999 minutes
- Digital voltmeter and ammeter
- Constant Potential for 12 and 24V sealed lead-acid batteries. 35V max for NiCad
- AC switch
- AC line selector - on rear: 115 or 230V
Video Overview
| Alternate Models | |
|---|---|
| 11-13887 | Alternative Manufacturer's Part Number |
| 4142 | Manufacturer's PN |
| Alpha C-20 | Previous PN |
| Alpha C-25 | Alternative Part Number |
| C-20 | Previous PN |
| C-25 | Alternative Part Number |
| C25 | Alternative Part Number |
| General Information | |
|---|---|
| Part # | AlphaC25 |
| Manufacturer | Power Products |
| NSN | 6130015395316 |
| Manual 1 | View ALPHA C-25 Manual V2.1 |
| Shipping Information | |
|---|---|
| Product Weight | 53 lbs. |
| Product Dimensions | 15 x 6 x 14 in. |
| Schedule B | 8511500000 |
| ECCN | 9A991.d |
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AIRCRAFT COMPATIBILITY
This item is for use on all aircraft.
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QUESTIONS & ANSWERS
Yes. The Alpha C-25 is designed to charge one or two batteries of the same voltage rating simultaneously, up to a combined maximum of 25 amps. This makes it ideal for busy maintenance shops servicing multiple 12-volt or 24-volt aircraft batteries. Dual-output capability improves workflow efficiency without requiring a second charger.
The charger supports both constant potential (CP) and constant current (CC) charging modes. CP mode is typically used for sealed and vented lead-acid aircraft batteries, while CC mode is preferred for nickel-cadmium (NiCad) batteries. This flexibility allows maintenance technicians to follow manufacturer-recommended charging procedures for a wide range of battery types.
The built-in digital timer can be set from 0.1 to 999.9 minutes, allowing precise control over charge duration. This helps technicians meet battery CMM or ICA requirements without guesswork. The elapsed time display also provides clear documentation for maintenance records and quality control tracking.
The Alpha C-25 is compatible with 12- and 24-volt lead-acid batteries, including VRLA types, as well as 1- to 22-cell nickel-cadmium batteries. Its selectable voltage and charging modes make it suitable for general aviation, turbine aircraft, and support equipment batteries. Always follow the battery manufacturer’s maintenance manual for proper charging settings.
Yes. In constant potential mode, the end-of-charge voltage can be fine-tuned using front-panel trimpots. This allows technicians to verify or adjust voltage settings for 12V or 24V charging as needed. Such adjustability is useful when accommodating specific OEM battery requirements.
The digital voltmeter and ammeter provide high accuracy, with the voltmeter within ±0.3 volts and the ammeter within ±0.3 amperes. This level of precision supports consistent, repeatable aircraft battery servicing. Accurate monitoring is critical for preventing overcharging or undercharging.
The Alpha C-25 operates on either 115V or 230V AC, selectable on the rear panel. It is designed to operate within ±5% line fluctuation for stable operation. This dual-voltage capability makes it adaptable for hangar environments in domestic or international locations.
The charger should be placed on a sturdy workbench in a well-ventilated area for battery servicing. At least 6” of clearance is recommended behind the unit to maintain proper airflow for cooling fans. Adequate ventilation helps prevent overheating and extends equipment lifespan.
Calibration verification is recommended every 12 months, depending on usage and environmental conditions. The manual outlines procedures for verifying voltage and current using external, calibrated meters. Routine inspection of cables, connectors, and fuses further ensures safe, reliable operation.
Regularly inspect DC battery cables, keep cooling fan vents clean, and replace fuses as required. The unit includes both AC and DC line fuses to protect internal components. Keeping the charger in a clean, dust-free environment will improve cooling efficiency and overall reliability.
