CLB2016 is the rechargeable battery used in Casio's GPW-1000, OCW-G1000 and MRG-G1000 solar GPS watches. Because all these are out of my price range to buy, at first I was paying very little attention to them. But a recent thread stirred up my interests to research a bit more into them, to my surprise there's no mention of the battery type used in Casio websites and manuals. Aside from one mention here in the forum by a member happened to look up parts in Pacparts and a few references in the web tying this battery type to the watches, there's nothing else as I could find either.
The CLB2016 and bigger versions CLB2032/3032 turned out to be relatively new product developed by Maxell. CLB simply stands for Coin Lithium-ion Battery. Maxell also provides its charge control circuits, to make sure the battery's charging safely and optimally. The table below is a comparison to another rechargeable of same size ML2016, its non-rechargeable counterpart CR2016, and the usual rechargeable battery CTL1616 used in older G's.
You can see the new battery can generate a lot of current at discharge, more so than the others. But the optimal charging temperature is only a small range from 0 to 45 degrees C. Meaning it won't charge in a very hot summer day, or in winter when it drops just below freezing. There are some data I couldn't find for the other battery, if you can find them feel free to post.
CLB2016 ML2016 CR2016 CTL1616 Diameter (mm) 20 20 20 16 Thickness (mm) 2.0 1.6 1.6 1.6 Weight (g) 2.1 1.8 1.7 1.1 Operating Temperature (deg. C) -20 to +60 -20 to +60 -20 to +85 -10 to +60 Chemicals Lithium-ion Lithium Manganese
Lithium Cobalt Oxide /
Lithium Titanium Oxide
Nominal Capacity (mAh) 30 25 90 18 Nominal Voltage (V) 3.7 3.0 3 2.3 Nominal Discharge Current (mA) - 0.2 0.1 1.0 Max Discharge Current (mA) 60 Continuous: 8
- Charging Voltage (V) 4.2 3.1 N/A 2.6 Charging Current (mA) 15 - N/A 3.0 Charging Temp (deg. C) 0 to +45 - N/A - Charging Cycles 500+ 500+ N/A 100+