12V/24V 20A Smart Battery Charger - Lead Acid, LiFePO4, AGM Compatible
12V/24V 20A Smart Battery Charger - Lead Acid, LiFePO4, AGM Compatible
Advanced 20A smart charger handles multiple battery chemistries: lead-acid, AGM, and LiFePO4 lithium. Detects battery type automatically and charges at optimal rates, maximizing battery lifespan and safety. 3-stage charging (bulk, absorption, float) ensures deep-cycle batteries recharge fully without overcharging damage. Switchable 12V and 24V systems. Ideal for: campervans, caravans, 4WDs with secondary batteries, boat batteries, RV shore power charging. Compact design fits under seat or in engine bay. Weatherproof housing survives harsh camping conditions. Australian support and 2-year warranty included.
Key Features
Auto-Detect Battery Chemistry
Automatically identifies lead-acid, AGM, or LiFePO4 battery type and adjusts charging algorithm accordingly. No manual selection required.
20A Charging Current
Fast charging speed: 100 Ah battery charges from 50% to 100% in 4-5 hours. Adjustable output for smaller batteries (5A, 10A, 20A settings).
12V/24V Switchable
Works with 12V vehicle systems or 24V truck/caravan systems. Single charger covers all applications.
3-Stage Smart Charging
Bulk stage: rapid charge at maximum current
Absorption stage: steady voltage, tapering current
Float stage: maintenance charge, prevents discharge
Multi-Chemistry Support
Lead-acid: standard charging algorithm
AGM: optimized AGM profile (higher absorption voltage)
LiFePO4: BMS-compatible charging (lower float voltage, protection circuit safety)
Technical Specifications
| Spec | Detail |
|---|---|
| Charging Current | 5A, 10A, 20A selectable |
| Input Voltage | 240V AC |
| Output Voltage | 12V or 24V DC (switchable) |
| Battery Types | Lead-acid, AGM, LiFePO4 |
| Max Battery Capacity | 500 Ah (12V), 250 Ah (24V) |
| Charging Speed | 20A at 13.8V (12V), 27.6V (24V) |
| Dimensions | 250mm x 180mm x 120mm |
| Weight | 4.2 kg |
| Input Cable | 2m 240V AC mains plug |
| Output Connectors | Anderson plugs or battery terminal clamps |
| Display | LED indicators (charging, fault, complete) |
| Warranty | 2 years |
| Certifications | RoHS, CE compliant |
Battery Charging Times
100 Ah Lead-Acid Battery (12V)
From 50%: 4-5 hours at 20A
From 0%: 8-10 hours at 20A
100 Ah LiFePO4 Battery (12V)
From 50%: 3-4 hours at 20A
From 0%: 6-8 hours at 20A
24V System: Double Charging Time (approx)
50 Ah 24V battery: 2-3 hours from 50%
Perfect For
Secondary/leisure battery charging at home
Caravan shore power charging
4WD dual battery top-up
Boat and marine battery charging
RV pre-trip battery conditioning
Battery storage maintenance
Multiple battery type households
Installation and Setup
Home Charging (Simplest)
Place charger near battery. Plug 240V mains cable into wall outlet. Connect output Anderson plugs or clamps to battery positive and negative. Turn on. Charger auto-detects battery type and begins charging.
Permanent Installation (Optional)
Run output cables to battery (use appropriate gauge: 6-10mm2 for 20A). Install battery disconnect switch between charger and battery (safety feature). Mount charger on wall or shelf near battery.
Setup Steps
-
Identify battery type (check label or manual)
-
Set voltage selector to 12V or 24V
-
Plug charger into 240V outlet
-
Connect output cables to battery (positive first, negative second)
-
Check LED indicators (should show charging status)
-
Monitor charging progress
Safety Tips
Do not charge frozen batteries. Ensure good ventilation around charger. Check battery water levels before charging (lead-acid only). Never reverse polarity (red to positive, black to negative).
Customer FAQs
Q: Will this work with my lithium battery?
A: Yes, specifically supports LiFePO4 (Lithium Iron Phosphate). Auto-detects and charges safely. Works with BMS (battery management system) equipped lithium batteries.
Q: Can I charge multiple batteries at once?
A: No, one battery per charging session. If you have multiple batteries, charge one completely, then connect the next.
Q: How often should I charge?
A: Lead-acid: charge after each use, avoid deep discharge. LiFePO4: can stay partially charged indefinitely, no memory effect. Charge when below 50% for optimal lifespan.
Q: What if I leave it plugged in after charging is complete?
A: Safe. Float stage maintains battery at optimal voltage without overcharge. Can leave connected indefinitely for trickle charging.
Q: Does this work with solar?
A: No. This charger requires 240V AC mains power. For solar charging, use MPPT charge controller instead.
Q: Can I use this in a caravan park powered site?
A: Yes, perfect for caravan parks with 15A or 20A power outlets. Charges secondary battery while parked.
What Is Included
✓ 20A smart battery charger unit
✓ 240V AC mains cable (2m)
✓ Anderson plug output connectors
✓ Battery terminal clamp set
✓ User manual with voltage/current guides
✓ Warranty card
✓ Weekendr technical support contact