Acer, eMachines, and Gateway are all the same company.

Examples of Acer part numbers: AP18C4K, ASO9A61, 916C4820F, AK.006BT.021, NX.MXZED.020

Examples of Apple part numbers: A1322, A1396, 020-6380-A, M9325G/A, MB471LL/A, 661-4833

Examples of Asus part numbers: C41N1904, B31N1635, 0B200-02560100, 90-NE51B2000, C21N1309

Examples of Dell part numbers: JOPGR, M5Y0X, KM978, 0CFX97, N18GG, P29S001

Examples of Fujitsu part numbers: FMVNBP210, FMVNBP198, BTP-B4K8, 21-92441-03

HP and Compaq are the same company. HP is one of the easiest brands to find battery part numbers. There should be a white sticker with a barcode on every battery, and on this sticker, there is what HP calls a “Spare” number. Usually the sticker shows, “Replace with HP spare” and following that are 6 digits with a dash and 3 more digits. There are various other numbers stamped on HP batteries that you can use to cross reference if the white sticker is damaged or missing. These numbers start with “HSTNN” and then a dash and several numbers and/or letters. On certain batteries, there is also a number/letter code near the HP logo. This code is two letters followed by a few numbers.

Examples of HP part numbers: HT03XL, KI04, 593553-001, HSTNN-104C

Lenovo and IBM are the same company.

Examples of Lenovo part numbers: L08S6D13, 45N1001, L18C4PF3

Examples of IBM part numbers: FRU 02K6928, ASM 92P1138, 02K6824

Examples of MSI part numbers: BTY-S14, BTY-M6L

Examples of Panasonic part numbers: FZ-VZSU84AU, CF-VZSU72U

Examples of Samsung part numbers: AA-PBTN4LR, AA-PB9NC6B

Examples of Clevo part numbers: N850BAT-6, 6-87-w650s-4e7

Examples of Toshiba part numbers: PA5278U-1BRS, PA5208U-1BRS