Watch Crown Symbols
Rolex watch crowns have symbols. Vintage Panerai crowns have a + symbol. Rolex and Panerai cooperated. Modern Rolexes have a cross. Pre-1960s Rolexes should not have a cross. The cross means the crown is wrong. Rolex crowns have dots or lines. The markings differentiate models.
Understanding Watch Model Numbers
Casio watch model numbers matter. Numbers describe watches. Identical ads may have different numbers. This helps avoid mispurchases. The number conveys meaning. It is not random characters. The number has special meaning. It guides understanding.
SR Battery Insight
What is SR short for?
What is an SR battery? An SR battery, also called an LR button battery, has a flatter discharge curve than an alkaline battery. It also has a greater run time than a lithium ion battery. An SR battery does not have flammability issues or need thermal runaway protection.
SR indicates a silver oxide battery. Silver oxide batteries contain heavy metals. Batteries labeled with a P are rechargeable. They contain heavy metals or mercury.
An example is an SR44W battery. It works well in flashlights. An LR41 battery is equivalent to an AG3 or LR736 battery. The LR41 is an alkaline battery with an optimal temperature of 20°C.
SR616SW batteries can replace SR65, SR616 and other watch batteries. Energizer 357 and SR44W batteries are identical in size. Using an SR44 battery instead of an LR44 provides higher voltage and capacity.
CR2032 and CR2016 button cell batteries have different capacities. The CR2032 battery lasts longer. It works better in devices needing more power. The CR2016 battery fits well in watches and calculators.
Choosing batteries requires checking device recommendations. Using the wrong battery can reduce performance. Button cell batteries pose safety risks to children. Their size and shine makes them attractive. But they can cause severe internal burns in hours if swallowed.