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Casio B-820 / B-821 Manual — Module 244

One owner's manual PDF for the Casio module 244 in English. Casio fitted it in the B-820 and B-821. Casio's spec sheet lists one 396, with 15 months of battery life and accuracy within ±10 seconds a month; the module first shipped in Aug 1982.

Module details

Brand: Casio

PDF files: 1

Released: Aug 1982

Mapped models: 4

Module specs

Battery: 396 (silver-oxide)

Rated battery life: 15 months

Rated accuracy: ±10 sec/month

Casio service manual ref: S/M-132

Open Casio battery finder

Owner manuals

Watch models using this module

ModelReleased
B-8201984
B-8201984
B-8201984
B-8211984

Watches in stock using this module

$89.10eBay $99.00
Rare Vintage Casio B820 Men’s Digital Sports Watch Module 244 JDM 1980s

Rare Vintage Casio B820 Men’s Digital Sports Watch Module 244 JDM 1980s