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Black rectangular 12V smart battery charger with clamps and display

Metra TP108MB 25A 12V Smart Battery Charger

SKU CH-8W2D-93G4S MPN TP108MB

A 12 V smart charger with 2, 10 and 25 A settings, automatic desulphation, winter mode and engine-start function for AGM, gel and deep-cycle batteries

  • Amperage15 A
  • Product colorBlack
  • Key features25A, NEMA 1-15 (Type A) and Battery Clamps, 25 A, 120 V AC,
  • Charges a 100Ah battery in under 3.5 hours with 25A maximum current
  • 85% charging efficiency reduces energy waste compared to 75% industry average
  • Fully automatic operation detects battery status and starts charging within 30 seconds
  • Pulse repair mode maintains safe voltage for long-term storage after full charge
  • Compatible with 12V STD, AGM, GEL, Wet, MF, EFB, calcium and deep-cycle batteries

Smart 12 V battery charger with engine start

The Metra TP108MB is a fully automatic 12 V smart charger and maintainer that also provides a 25 A engine-start boost. It supports STD, AGM, GEL, Wet, MF, EFB, calcium and deep-cycle lead-acid batteries in cars, boats, RVs and powersports equipment. Four selectable rates (2 A, 10 A, 25 A and AUTO) let you match the charge to the battery condition. The unit connects via NEMA 1-15 mains plug and included battery clamps.

Suits owners who need one tool for charging.

Ideal for garages and workshops that service mixed 12 V lead-acid types and want automatic desulfation, winter mode and long-term maintenance without supervision. Not suited for 6 V systems or lithium chemistries, and buyers who only need a low-current maintainer may find the 25 A capability unnecessary.

Maximum 25 A charge rate for fast turnaround

The 25 A peak current can bring a 100 Ah battery to full charge in under 3.5 hours at 85 % efficiency. Lower 2 A and 10 A settings are available for smaller batteries or overnight maintenance. Input is 120 V AC 60 Hz and the charger weighs 5.00008410216 lb.

How it compares

Measured against everything we stock in Jump Starters, Chargers & Power Packs, at today’s prices. Recalculated every night.

Price $107.99
Pricier than about 90% of the 1,744 comparable items (median $14.99).

Specifications

Product
Brand nameMetra
Model nameTP108 MB
Product colorBlack
Power
Amperage15 A

Questions about this item

How do I hook up the Metra TP108MB to a 12 V battery and what is the step people often miss?

Connect the AC plug to a 120 V 60 Hz outlet, clamp the red lead to positive and black to negative, then press Start within 30 seconds or the unit will auto-start with the last used setting.

What part of the charger will need attention or replacement after extended use?

The battery clamps and the NEMA 1-15 power cord are the only wear items; inspect the clamp jaws for corrosion and the cord insulation for cracks every few months.

What limit appears first when the charger runs at its 25 A maximum for a long period?

The 85 % efficiency ceiling means roughly 15 % of input power becomes heat, so the internal thermal protection will trip before the 25 A output can be sustained indefinitely.

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