Listed capacities across the search results include 265 mAh, 220 mAh, and 210 mAh.
“Single-use” (not rechargeable) means the cell is intended for one-time use and should not be recharged.
Mentioned safety features include a non-toxic bitter coating to discourage ingestion, child-resistant or child-secure packaging, and a mouth-dyeing agent that colors the mouth after contact with saliva to indicate possible ingestion.
Some listings state a storage life of up to 12 years, while others list a storage life of 10 years.
Some listings list weights around 2.9–3 grams; other listings give weights in pounds in the range of about 0.01–0.04 lb (unit reporting is inconsistent across listings).