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Black rectangular battery charger with LED indicator and attached cables

Metra 021-0128 12 V 1.25 A Battery Charger

SKU CH-6KBT-5TA53

A 12 V 1.25 A smart charger that automatically maintains automotive, motorcycle, ATV and lawn-mower batteries with a four-step programme and ISM monitoring

  • Amp15 A
  • ColorBlack
  • FeaturesSynthetic, Black, 1.25 amps, 120 volts_of_alternating_curren
  • Adaptive smart charging extends 12 V battery life
  • Four-step programme safely charges and maintains battery
  • Quick-disconnect harness enables fast, hassle-free connection
  • Two-colour LED shows charge status at a glance
  • Compatible with sealed, flooded, AGM and GEL batteries

Metra 021-0128 12 V Battery Maintainer

The Metra 021-0128 is a 12 V 1.25 A smart battery charger and maintainer designed for automotive, motorcycle, ATV and lawn-mower batteries. It uses a four-step charging programme with adaptive monitoring to suit sealed, flooded, AGM and GEL chemistries without manual selection. A quick-disconnect harness lets you leave ring terminals fitted for convenient access. Two-colour LED indicators show charge status from initial bulk charge through to full maintenance mode.

Suits owners who need long-term maintenance.

This unit is built for keeping batteries at peak condition during storage or infrequent use rather than recovering deeply discharged packs quickly. Its 1.25 A output is too low for jump-starting or fast charging large automotive batteries. Buyers who need higher amperage for rapid recovery or engine cranking should look at more powerful chargers or dedicated jump starters.

Sustained operation stays cool and regulated

The charger transitions automatically from bulk to absorption, then float and maintenance phases, preventing overcharge during indefinite connection. ISM adaptive technology continuously adjusts output to real-time battery condition, so the unit can remain connected for months without degrading the cells. Solid green indication confirms the battery is fully charged and under monitoring, while voltage drop under load triggers a return to full output power.

Highlights

  • Adaptive smart charging extends 12 V battery life
  • Four-step programme safely charges and maintains battery
  • Quick-disconnect harness enables fast, hassle-free connection
  • Two-colour LED shows charge status at a glance
  • Compatible with sealed, flooded, AGM and GEL batteries

Specifications

BrandMetra
Model021-0128
Amp15 A
ColorBlack
FeaturesSynthetic, Black, 1.25 amps, 120 volts_of_alternating_current, 12 volts, 1, Manufacturer Warranty, false, 1.45 pounds

Questions about this item

What type of 12 V battery does the 1.25 A charger work with?

It works with 12 V sealed, flooded, AGM, and GEL batteries without manual selection.

Can the ring terminals stay on a battery that is still in the vehicle?

Yes, the two-in-one cable lets you remove the alligator clips and leave the ring terminals on the posts for quick reconnection.

What does the two-color LED show when the battery is above 80 % charged?

A flashing green light means the battery is greater than 80 % charged; solid green means it is being monitored at full charge.

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