27A ,23A battery (also called A23, MN21, 23AE, GP23A, V23GA, L1028, 8LR932, etc.)
It is a small, cylindrical 12-volt alkaline primary (non-rechargeable) battery.
Key specifications
Voltage: 12 V nominal
Chemistry: Alkaline (zinc-manganese dioxide)
Capacity: Typically 30–60 mAh
Size: ≈ 10.0–10.3 mm diameter × 28.2–28.5 mm length
Weight: ≈ 8 g
Construction: Eight tiny 1.5 V LR932 button cells stacked in series inside one wrapper
Mercury-free (as marked on the pack)
Shelf life: Usually 3–5 years
Common uses
Primarily for low-drain, intermittent devices that need higher voltage in a very compact size:
Car key fobs / keyless entry remotes
Garage door / gate openers
Wireless doorbells and security sensors