Fu Nan batteries are mostly alkaline batteries, so the letter L should be added before the national standard model. Commonly used battery models are 1, 2, 5 and 7. To distinguish what kind of battery it is, you can judge from the model marked on the battery casing:

1 battery, the national standard model is R20/LR20, the English code is d, the diameter is 34.2mm, and the height is 6 1.5 mm, which is widely used. There are D-type batteries in civil, military and special DC power supplies.

No.2 battery, the national standard model is R 14/LR 14, the English code is C, and the diameter is Ф Ф 26.2 mm; ; The height is 50.0 mm.

No.5 battery, GB model R6/LR6, English code AA, diameter Ф Ф14.5mm; ; The height is 50.5 mm

No.7 battery, the national standard model is R03/LR03, the English code is AAA, and the diameter is Ф Ф10.5 mm; ; The height is 44.5 mm.

Extended data:

Several methods to identify the authenticity of Fu Nan battery;

1. The design words on the trademark of genuine Fu Nan battery cannot be scraped off. If you can scrape off the combination of words on the trademark, you can identify it as a fake.

2. If you can't remove the production date code by wiping with alcohol or scraping with a knife, you can judge that the battery is a fake.

3. Fake shaped charge rings are all attached with a plastic ring, even falling off at a glance, which is very rough and uneven in edge. Genuine and battery are integrated, which is the most obvious and easy to master.

References:

Baidu Encyclopedia-Fu Nan Battery