does this replace a 621 battery?

If you have an SR621 battery, Yes it does. But not a brand name designater 621. You MUST be careful with only replacing SR621 with SR621. Check your old battery first.

Is the 5 pack 5 batteries or 25 batteries? It say multiple places there are 5 batteries per pack.

It is 5 batteries....not 5 packs of 5 ea....you can also buy a 10 pack which is just 10 batteries in the pack. Each battery has it's own blister pack and they are all attached, so you just tear each single battery pack along the dotted line to separate one at a time so the rest stay sealed. Hope that helps....

does this replace the 321 watch battery?

I don't think so. It would be a 364. (the 621) Sorry

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Description

🔋 Power Your Life, Sustainably!

COMPACT DESIGN - Perfectly sized at 6.8mm diameter and 2.6mm height.
ECO FRIENDLY CHOICE - Enjoy peace of mind with 0% mercury composition.
POWER UP YOUR DEVICES - Reliable 1.55V output for optimal performance.
VERSATILE COMPATIBILITY - Fits a wide range of devices with multiple reference numbers.
PACK OF 5 FOR CONVENIENCE - Stock up and never run out of power when you need it most.

The 5 x Sony 364 SR621SW Silver Oxide Batteries are a reliable and eco-friendly power solution, featuring a 1.55V output and a compact design. With zero mercury content, these batteries are safe for both your devices and the environment. Compatible with various devices, this pack of five ensures you always have power on hand.

Item Weight	0.1 Pounds
Unit Count	5.0 Count
Battery Cell Type	Silver Oxide
Recommended Uses For Product	Watch
Reusability	Single Use
Battery Capacity	23 Milliamp Hours
Voltage	1.55 Volts

5 x Sony 364 SR621SW Silver Oxide 0% Mercury Batteries [ Pack of 5 ]

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