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Small rectangular black lithium-polymer battery for Apple Watch Series 1 42mm

KingSener

KingSener A1579 cell phone battery Apple Watch Series 1 42mm

SKU CH-515T-YNF6S

Replacement lithium-polymer cell rated 3.78 V and 246 mAh for Apple Watch Series 1 42 mm

  • Battery voltage rating3.78 V
  • Battery capacity0.93WH/246 mAh
  • Direct replacement for Series 1 42mm models A1579 and A1554
  • 246 mAh capacity restores original runtime
  • 78 V lithium-polymer cell matches factory voltage
  • Brand-new condition ensures full 100 % performance out of the box
  • Black finish blends with the watch housing

KingSener A1579 replacement battery

The KingSener A1579 is a lithium-polymer replacement cell built for the Apple Watch Series 1 42mm and the first-generation 42mm Sport model carrying part number A1554. It restores original runtime for owners whose factory pack no longer holds a charge.

Practical limits of the 3.78 V 0.93 Wh cell

Rated at 3.78 volts and 0.93 watt-hours (246 mAh), the pack matches the electrical envelope Apple specified for the 42 mm Series 1 chassis. Capacity cannot exceed the watch’s internal volume, so heavy GPS or workout use will still require daily charging.

Black Li-polymer pouch with flex connector

The black soft-pack cell ships brand-new with a pre-attached flex ribbon that aligns to the Series 1 logic-board socket. Adhesive strips are not included, so installers must supply their own water-resistant seal to maintain the watch’s original ingress protection.

How it compares

Measured against everything we stock in Replacement Phone Batteries, at today’s prices. Recalculated every night.

Price $18.99
Pricier than about 75% of the 868 comparable items (median $14.99).

Specifications

Product
Brand nameKingSener
Model nameA1579
Part numberA1579 A1554
Power
Battery voltage rating3.78 V
Battery capacity0.93WH/246 mAh

Questions about this item

Which capacity should I choose for my Apple Watch Series 1 42mm?

This model provides 0.93WH or 246mAh at 3.78V, matching the original specification for the 42mm Series 1 case.

What does the 246mAh rating mean for daily runtime?

It restores the factory capacity, giving the same typical day of mixed use that the watch delivered when new.

Does the A1579 part number fit the 42mm Series 1 Sport model A1554?

Yes, the battery replaces both A1579 and A1554 part numbers for the 42mm first-generation Sport case.

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