No idea, but check About This Mac… > System Report > Power; on the one I just replaced, Manufacturer reads “ifixit”.
Did the same yesterday; took me closer to 4-5 hours as I was being “exceedingly careful”, as it was my wife’s laptop and she’d been hit with a “perfect storm”: battery died and backup was corrupt (backups.db reported a size of 0, and Migration Assistant hung while trying to look for it). o_O Otherwise, everything worked well, laptop is operational again, and my wife’s files have been backed up, migrated to another laptop, and the backed up again - so she currently has 4x copies of all her files. \o/
On an A1398, these were T6, not T5.
For an A1398, the screws on the adjacent cover were T6, not T5; one of the tips in the battery kit was suitable.
Additionally, this is an “opportunity” to clean the cooling fans - and any other obvious dust magnets - with a can of compressed air. On the laptop I worked on, the cooling fans had sufficient dust to not “spin” freely - showing signs of “drag”. After blasting each cooling fan with compressed air (including from the exhaust vent side, as hitting the fins alone wasn’t adequate), they both spin freely now. No obvious signs of battery swelling on mine, but lack of adequate airflow could have been a factor with original battery aging/failure.