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Small rectangular lithium-ion battery cell for Apple Watch Series 7 45mm

eForChina

eForChina Li-ion Battery Apple Watch Series 7 45mm 309mAh

SKU CH-NS10-TT1YN

Li-ion replacement battery for Apple Watch Series 7 45mm delivering 309mAh with comparable standby and talk time

  • Product typeWatch Batteries
  • Li-ion chemistry eliminates memory effect for reliable daily charging
  • 309 mAh capacity restores comparable standby and talk time
  • Integrated microchip prevents overcharging and extends battery lifespan
  • Designed specifically for Apple Watch Series 7 45 mm
  • Authorised charger required for safe and optimal performance

Compatible Apple Watch Series 7 45mm

This lithium-ion battery is designed as a direct replacement for the 45mm Apple Watch Series 7. It restores the original capacity so the watch regains comparable standby and talk time. The integrated microchip protects against overcharging to extend overall service life.

Low self-discharge chemistry

The Li-ion cells have no memory effect, so partial charging does not reduce usable capacity. Normal operation stays cool because the chemistry generates minimal heat during daily charge cycles. Power draw matches the factory specification without extra strain on the charging circuit.

Authorised charger required

Safe operation depends on using only the approved charger supplied with the watch. The pack must never be disassembled, crushed, short-circuited or exposed to fire or water. For long-term storage keep it in a dry, cool place and top up the charge every three months.

How it compares

Measured against everything we stock in Watch Bands, Cases & Chargers, at today’s prices. Recalculated every night.

Price $11.99
Cheaper than about 65% of the 358 comparable items (median $14.99).

Specifications

Product
Product typeWatch Batteries

Questions about this item

How do I install the 309mAh Li-ion battery in my Apple Watch Series 7 45mm, and what step do people often miss?

The battery fits the 45mm Series 7 case. A common mistake is not reseating the flex connector fully, which causes the watch to fail to power on after reassembly.

What maintenance will this 309mAh Li-ion battery need later?

If stored unused, keep it in a dry, cool place and charge it to full once every three months. The integrated microchip prevents overcharging, and Li-ion chemistry has no memory effect.

What limit appears first under sustained use of this 309mAh Li-ion battery?

The 309mAh capacity determines runtime. Continuous high load will deplete the charge fastest, while the internal microchip stops overcharging to protect the cell.

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