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Rectangular black lithium-ion laptop battery with connector and label

FOCUSTEC

FOCUSTEC BTY-M6J laptop battery 11.4 V 64.98 Wh 5700 mAh 3 cell 500 cycles

SKU CH-969K-XZ9GY MPN BTY-M6J

Replacement lithium-ion battery delivering 11.4 V and 64.98 Wh for compatible MSI GS and WS series laptops, rated for up to 500 recharge cycles

  • Battery TypeLithium-Ion
  • Reliable power for MSI GS and WS series laptops
  • 4 V lithium-ion chemistry delivers 64.98 Wh capacity
  • 5700 mAh rating supports extended mobile sessions
  • Up to 500 recharge cycles over the battery life
  • Replaces original BTY-M6J, BTY-U6J and MS-16K4 codes

Replacement battery for MSI GS and WS series

This lithium-ion unit replaces the original BTY-M6J or BTY-U6J packs in compatible MSI GS63, GS73 and WS63 notebooks. It delivers 11.4 V and 64.98 Wh from three cells for 5700 mAh of capacity. Buyers who need a different voltage or a higher cycle count cannot use this pack.

Thermal and power behaviour

The battery operates at the rated 11.4 V without additional cooling requirements in normal use. Power draw follows the host laptop’s power-management profile and the 500-cycle rating reflects typical charge and discharge patterns. Users who expect sustained high-current loads beyond the original specification should verify compatibility first.

Build quality and installation

The three-cell lithium-ion construction matches the original form factor for the listed MSI models. A correct connector match is essential, so the part number on the old battery should be confirmed before fitting. Technicians who cannot access the internal battery compartment will not be able to install this unit.

Highlights

  • Reliable power for MSI GS and WS series laptops
  • 4 V lithium-ion chemistry delivers 64.98 Wh capacity
  • 5700 mAh rating supports extended mobile sessions
  • Up to 500 recharge cycles over the battery life
  • Replaces original BTY-M6J, BTY-U6J and MS-16K4 codes

Specifications

Battery TypeLithium-Ion

Questions about this item

How do I install the BTY-M6J battery in my MSI GS63 or GS73, and what step is often missed?

Remove the bottom case, disconnect the old battery connector, fit the new 3-cell 11.4 V pack, reconnect the same connector, and secure the case screws; the step most people skip is verifying the original part number (BTY-M6J or BTY-U6J) on the old battery before ordering.

What maintenance or replacement will the BTY-M6J need over its life?

The lithium-ion pack is rated for up to 500 recharge cycles; after that capacity drops noticeably, so plan to replace the battery once runtime no longer meets your needs.

What limit appears first during sustained use of the 64.98 Wh BTY-M6J?

The 500-cycle rating is the first hard limit — beyond that the 5700 mAh capacity degrades and run-time shortens even if the cells still hold charge.

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