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Same shape — different chemistry. PP3 is the physical format. 6LR61 is the IEC code for alkaline chemistry and 6F22 is the IEC code for zinc-carbon (carbon-zinc) chemistry. They are both 9V rectangular batteries that physically fit the same devices, but alkaline (6LR61 / MN1604) has significantly higher capacity (550–600 mAh vs ~200 mAh) and a much longer shelf life. Many brands label their alkaline 9V as "6F22" anyway, causing confusion. In practice, look for alkaline or check for MN1604, 522, or 6LR61 on the label for the better-performing version.

They look the same but are not interchangeable. Both are 20mm wide and run at 3V, but the CR2032 is 3.2mm thick and the CR2025 is only 2.5mm thick. A CR2025 may physically fit in a CR2032 slot but will sit loose, causing poor contact, and will run out significantly faster (165 mAh vs 220 mAh). For key fobs, AirTags, and medical devices — always use the exact specified battery.

Same physical size — completely different chemistry. LR44 is alkaline (1.5V, voltage drops during discharge). The 357 and SR44 are silver oxide (1.55V, voltage stays flat until the battery is nearly dead). For watches and precision instruments, silver oxide is essential — the stable voltage ensures accurate timekeeping. Using LR44 in a watch movement can cause it to lose time as the battery drains. For toys and basic gadgets, alkaline LR44 is perfectly fine and less expensive.

Yes — completely identical. 377 is the Energizer/Rayovac designation and SR626SW is the IEC standard code. Both refer to the same 6.8 × 2.6mm silver oxide battery. You may also see it as D377 (Duracell), V377 (Varta), SB-AW (Seiko), or BA (Citizen). It is the most common watch battery in the world, found in most analogue quartz watches from Seiko, Citizen, Timex, Sekonda, Rotary, and Accurist.

High-drain (W) vs low-drain (SW). The W suffix indicates a high-drain battery using potassium hydroxide electrolyte — suited to watches with backlights, alarms, or digital displays. SW indicates low-drain using sodium hydroxide — for standard analogue watches. Both versions share identical dimensions and 1.55V output. Modern "multi-drain" batteries from Renata, Energizer, and Duracell now cover both applications, so a single 371 can replace both 370 and 371 in most cases. If in doubt, choose a multi-drain cell.

Yes, in most cases. BR2032 uses lithium polycarbon-monofluoride chemistry rather than the lithium manganese dioxide of a standard CR2032. Both deliver 3V in the same physical size. BR cells have a lower self-discharge rate and perform better in extreme temperatures, which is why they appear in industrial and medical equipment. For everyday use in key fobs, remotes, and BIOS chips, a CR2032 is preferred. Either will work in most consumer devices.

The IEC naming system encodes everything in the number: SR = silver oxide (1.55V). 626 = 6.2mm diameter × 2.6mm height (first two or three digits are the diameter in tenths of a mm; last two are the height). SW = low-drain (sodium hydroxide electrolyte). So SR626SW is a 6.8mm × 2.6mm silver oxide, low-drain watch battery. High-drain equivalent would be SR626W (i.e. the 376 rather than the 377).