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Rectangular lithium battery pack, matte finish, 69.0 by 36.8 by 19.0mm

Estry

Estry PJ9B standard battery 2500mAh 7.4V

SKU CH-MZBQ-8ZANM MPN PJ9B

Replacement lithium battery for LG portable speakers, 2500mAh at 7.4V with overcharge and short-circuit protection

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeLithium
  • Battery Capacity2500mAh
  • Battery Voltage7.4
  • 2500mAh capacity powers LG speakers longer
  • 4V lithium cell matches original voltage exactly
  • 0×36.8×19.0mm form factor fits PJ9B, NP7550, PK7 models
  • ISO9001, RoHS, CE, UN38.3, MSDS certified for safety
  • Built-in overcharge, over-discharge, over-voltage and short-circuit protection

Direct replacement for LG portable speakers

The Estry PJ9B is a 2500mAh lithium battery built to the original equipment specifications for LG models including the Xboom Go PK7 and Music Flow P7. It matches the factory voltage of 7.4V and delivers 18.5Wh of energy in a single pack. The cell carries ISO9001, RoHS, CE, UN38.3 and MSDS certifications.

Protection circuits maintain output during

Overcharge, over-discharge, over-voltage and short-circuit safeguards are integrated to preserve cell health across repeated charge cycles. These circuits prevent the voltage from collapsing under continuous load, allowing the speaker to run at steady volume for the full rated capacity. The protection logic resets automatically once the fault condition clears.

Proprietary form factor limits use to listed LG

The pack measures 69.0 by 36.8 by 19.0mm and weighs 122.0g, matching the exact cavity and connector layout of part numbers EAC63320601, EAC63918901 and TD-Bb11LG. It cannot be adapted to other brands or generic 7.4V applications without mechanical and electrical modification. Buyers needing a universal power bank or a different connector type should look elsewhere.

Highlights

  • 2500mAh capacity powers LG speakers longer
  • 4V lithium cell matches original voltage exactly
  • 0×36.8×19.0mm form factor fits PJ9B, NP7550, PK7 models
  • ISO9001, RoHS, CE, UN38.3, MSDS certified for safety
  • Built-in overcharge, over-discharge, over-voltage and short-circuit protection

Specifications

BrandLG
TypeBatteries
Battery Pack1-pack
Battery TypeLithium
Battery Capacity2500mAh
Battery Voltage7.4

Questions about this item

Does the 7.4 V 2500 mAh cell run hot or draw extra power when the speaker plays all day?

The 18.5 Wh lithium pack is built to the same specification as the original, with over-charge, over-discharge, over-voltage and short-circuit protection, so it stays cool and efficient during extended playback.

Must I already own a specific LG speaker model for this battery to fit and connect?

Yes — it replaces part numbers EAC63320601 and EAC63918901 and fits the PJ9B, PJ9, NP7550, Xboom Go PK7, Music Flow P7 and PJS9W models only.

Will the 69.0 × 36.8 × 19.0 mm pack work in an older Music Flow P7 that still uses the original TD-Bb11LG cell?

The replacement matches the TD-Bb11LG part number and the 122.0 g weight, so it slots into the older P7 without any modification.

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