E-FAST 25A 12V/24V Smart Charger with Booster Mode
$105
Key Specs
| output | 25A |
| voltage | 12V / 24V |
| battery-types | AGM, Gel, Flooded, EFB, Calcium |
| weight | 4.1 lbs |
| dimensions | 12 x 5.5 x 4 in |
| warranty | 1 year |
Pros
- ✓ 25A output is among the fastest in the non-professional category
- ✓ Booster mode provides extra current for jump-starting weak batteries
- ✓ Dual 12V/24V support covers most automotive and marine systems
- ✓ LCD display with real-time voltage, current, and stage readout
Cons
- ✗ Larger and heavier than typical consumer chargers
- ✗ Fan noise is noticeable at full 25A output
Detailed Review
High-Output Charging When Speed Matters
There are situations where slow and steady does not win the race — a dead battery the night before a long trip, a fleet vehicle that needs to be back in service by morning, a boat that sat unused all winter. The E-FAST 25A charger was designed for exactly these scenarios. At 25 amps on a 12V battery, it delivers roughly 300 watts of charging power, which means a depleted 100Ah battery can be brought to full charge in four to five hours rather than the ten or more hours a typical 10A charger would require.
The dual 12V/24V voltage support extends that speed advantage to larger diesel vehicles, commercial vans, and 24V marine systems that are underserved by the predominantly 12V-focused consumer charging market. The voltage selection is straightforward via the panel controls, and the charger confirms the active setting on its LCD before engaging.
Booster Mode for Dead Batteries
The integrated booster mode is a step above a simple battery start feature. Rather than just delivering a high burst, the E-FAST’s booster function provides sustained elevated current to batteries that have fallen below normal starting thresholds, helping recover batteries that would otherwise require a jump from another vehicle. This makes it a practical addition to any garage or shop where dead batteries are a regular occurrence.
The multi-stage charging algorithm manages the transition from high-current bulk charging through absorption and into float maintenance. The real-time LCD display confirms each stage as the battery progresses through the charge cycle, and the charger automatically reduces to maintenance mode once the battery is full.
Who It’s For
The E-FAST 25A charger suits users who prioritize turnaround speed over compactness — shop technicians, fleet managers, serious overlanders who return from trips needing quick battery recovery, and RV owners who want to top off large battery banks without an overnight wait. The larger footprint and fan noise at full power are reasonable trade-offs at this output level. For lead-acid systems at 12V or 24V where charge time is the primary concern, the E-FAST 25A delivers.
