1. Introduction
The HTRC P35 is a versatile 12V-24V smart battery charger and maintainer designed for a wide range of vehicles and battery types. It features an LCD display, multiple charging modes, adjustable current levels, and advanced protection functions. This manual provides essential information for the safe and effective operation of your P35 charger.
Figure 1: HTRC P35 Smart Battery Charger
2. Important Safety Information
⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
- Always read the entire manual before using the charger.
- Ensure proper ventilation during charging.
- Do not expose the charger to rain or moisture.
- Keep out of reach of children.
- Disconnect the AC power before making or breaking connections to the battery.
- Only charge batteries with a Battery Management System (BMS) when using the Lithium mode.
3. Package Contents
Verify that all items are present in your package:
- 1x HTRC P35 Car Battery Charger
- 1x 2M Extension Power Cord
- 1x Cable Clip
- 1x User Manual
- 1x Retail Box
- Cable lugs (0.8cm diameter)
- Alligator clips (100cm length)
Figure 2: Package Contents and Charger Dimensions (approx. 230x112x65mm)
4. Specifications
| Feature | Specification |
|---|---|
| AC Input | 100-240 V, 50/60Hz |
| Output Voltage | 12 V / 24 V (Automatic Identification) |
| Max 12V Charge Current | 35A |
| Max 24V Charge Current | 18A |
| Minimum Starting Voltage | 2.0V |
| Power with Load | MAX 450W |
| Dimensions (approx.) | 230 x 125 x 70 mm (9.05 x 4.92 x 2.75 inches) |
| Compatible Battery Types | Lithium, LiFePO4, Lead-Acid (AGM, GEL, Calcium, EFB, MF, FLOODED, VRLA, SLA, WET) |
| Display | LCD Temperature Display (F+) |
| Special Features | Smart Charging, Battery Repair, Temperature Compensation, Multiple Protections, Built-in Cooling Fan |
Full Voltage of Different Batteries (Reference)
| Battery Type | Full of Voltage |
|---|---|
| 12V LITHIUM | Max 12.6V/14.7V |
| 24V LITHIUM | Max 25.2V/29.4V |
| 12V Lead-acid (AGM, GEL, EFB, MF, FLOODED, VRLA, SLA, WET, etc...) | Max 14.7V |
| 24V Lead-acid (AGM, GEL, EFB, MF, FLOODED, VRLA, SLA, WET, etc...) | Max 29.4V |
| 12V LiFePO4 | Max 14.6V |
| 24V LiFePO4 | Max 29.2V |
Figure 3: Full Voltage Reference Table for Various Battery Types
5. Setup and Connection
The HTRC P35 charger is designed for ease of use with automatic voltage identification (12V/24V).
- Prepare the Battery: Ensure the battery terminals are clean and free of corrosion.
- Connect Alligator Clips:
- Connect the RED (+) alligator clip to the positive (+) battery terminal.
- Connect the BLACK (-) alligator clip to the negative (-) battery terminal.
Ensure a secure connection. The charger will automatically detect the battery voltage (12V or 24V).
- Connect to Power: Plug the AC power cord into a suitable wall outlet.
Figure 4: Connecting the Charger to a Car Battery
6. Operating Instructions
6.1 Mode Selection
The P35 offers four selectable charging modes. Press the "MODE" button to cycle through the options:
- LITHIUM: For Lithium batteries (ensure BMS is present).
- AGM/Lead-acid: For standard Lead-Acid, AGM, GEL, Calcium, EFB, MF, FLOODED, VRLA, SLA, and WET batteries.
- LiFePO4: For Lithium Iron Phosphate batteries.
- REPAIR: For desulfation and reconditioning of deeply discharged or sulfated batteries.
Figure 5: One-Click Mode Selection
6.2 Adjustable Current Levels
The charger features a toggle switch to select one of three current levels, suitable for different battery capacities and charging speeds:
- 12V/10A (24V/5A)
- 12V/20A (24V/10A)
- 12V/35A (24V/18A)
Select the appropriate current based on your battery's capacity and desired charging time. For batteries below 30AH, it is recommended to use the minimum current level (10A/5A) for optimal battery health.
Figure 6: Adjustable Current Selection
6.3 Smart Charging Process (9-Stage)
The HTRC P35 utilizes a 9-stage smart charging process to optimize battery power precisely and gently, ensuring efficient charging and extending battery life:
- Battery Desulfation: Removes sulfates from battery plates.
- Soft Start Charging: Gradually introduces power to the battery.
- Bulk Charging: Charges the battery to approximately 80% capacity.
- Absorption Charging: Charges the battery to 100% at a decreasing current.
- Trickle Charge: Maintains the battery at full charge.
- Battery Test: Checks battery health and capacity.
- Recondition Charging: Restores deeply discharged batteries.
- Float & Maintenance Charging: Keeps the battery at optimal voltage.
- Small Current to Maintain Charging: Ensures long-term battery health.
Figure 7: 9-Stage Smart Charging Process
6.4 Automatic Features
- Automatic Voltage Identification: The charger automatically detects if the connected battery is 12V or 24V.
- Temperature Compensation: Built-in temperature detection adjusts charging parameters for optimal performance in both hot and cold environments, preventing over-charging or under-charging.
- Smart Charging Dead Batteries: The charger can automatically detect and charge batteries with voltage as low as 2V, unlike some chargers that require manual "forced mode."
Figure 8: Temperature Detection and Compensation
Figure 9: Smart Charging for Dead Batteries
7. Maintenance
- Keep the charger clean and dry.
- Store the charger in a cool, dry place when not in use.
- Regularly check the cables and clips for any damage. Replace if necessary.
- The built-in cooling fan helps maintain optimal operating temperature. Ensure its vents are not obstructed.
8. Troubleshooting
- Q: Does the LiFePO4 battery fully charge?
- A: When a LiFePO4 battery is fully charged, the charger may exhibit a callback function, reducing the charge by approximately 1V. This is normal behavior. The charger will continue uninterrupted charging with a low current after reaching full charge to maintain the battery.
- Q: Is it a problem if the fan makes noise?
- A: It is normal for the charger's fan to make a slight noise during operation. This indicates the cooling system is functioning to prevent overheating.
9. User Tips
- For batteries below 30AH, always use the minimum current level (12V/10A or 24V/5A) to ensure gentle and healthy charging.
- When charging Lithium batteries, ensure they are equipped with a Battery Management System (BMS) for safety and proper charging.
- The LCD display provides real-time information on charging status, voltage, and temperature. Monitor these readings for optimal charging.
10. Warranty and Support
For any product inquiries, technical support, or warranty claims, please refer to the contact information provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.
