Casio Tough Solar and solar batteries – how to choose the right battery?

Casio Tough Solar watches and other Casio models with solar charging use rechargeable cells. When replacing the battery, do not rely solely on its dimensions. It is best to select the appropriate cell based on the watch model, module number, and the designation of the old battery.

In Casio watches, you can find batteries such as CTL1616F, CTL920F, CTL1025F, CTL621F, and CLB3032. Below we present matches based on specific models and modules.

How to check which battery fits a Casio watch?

The easiest way is to start by reading the watch model or Casio module number. The module number is very useful because the same type of battery can be used in many different watches belonging to different series.

If the watch has already been opened, it is also worth checking the symbol on the installed cell.

Important: simply having a similar battery size does not mean it can be used as a substitute. You should select the type intended for a specific model or module of the watch.

Panasonic CTL1616F – battery for many Casio Tough Solar models

CTL1616F is used in a large number of Casio solar charging watches.

Examples of compatible series and models:
G2800, G5500, G5600, G7300, G7301, G9300, G9301, GW300, GW330, GW400, GW410, GW500, GW530, GW5600, GW600, GW610, GW6900, GW700, GW7900, GW800, GW810, GW9000, GW9100, GW9200, GW9400, GWM5600, GWM5610, GWM850, GWM9000, GWMB5000, GWG1000, GSTB200, MTG900, MTG910, MTG920, MTG930, MTG950, MTG960, MTGM900, OCW510, OCW800, OCWM700, OCWS1000, PAG240, PAG40, PAG50, PAG60, PAG70, PAG80, PAW1100, PAW1200, PAW1300, PAW1500, PRG240, PRG270, PRG330, PRG80, PRW50, PRW60, PRW5000, WVA300, WVA410, WVA420, WVA430, WVA470, WVA510, WVQ120, WVQ202, WVQ400, WVQ500, WVQ550, WVQ600, WS210H, STLS300H.

Compatible modules:
2616, 2628, 2629, 2634, 2637, 2638, 2687, 2688, 2696, 2727, 2730, 2752, 2762, 2763, 2766, 2767, 280, 2802, 2803, 2812, 2818, 2819, 2825, 2832, 2836, 2866, 2867, 2872, 2894, 2913, 2924, 2931, 2960, 2971, 3022, 3023, 3043, 3047, 3061, 3062, 3063, 3068, 3070, 3071, 3090, 3134, 3135, 3147, 3159, 3172, 3179, 3192, 3200, 3246, 3274, 3293, 3310, 3311, 3335, 3366, 3406, 3732, 430TE, 4717, 4722, 5022, 50T7V, 5105, 510A, 5114, 5184, 5325.

See Panasonic CTL1616F at Kurant store

Panasonic CTL920F – for selected Casio Solar watches

The battery CTL920F, also found under the designations CTL-920, CTL 920, or CTL 920 F, is used in selected Casio watches.

Fits models such as:
AQS800W-1B2V, AQS800W-1BV, AQS800W-1EV, AQS800WD, AQS810W, AQS810WC, AWGM100A, EFA134SB, EQS500C, EQS500CG, EQS500DB, EQSA1000DB, EQSA1000RB, EQSA500B, EQSA500DB, EQSA500RB, EQSA500RBP, EQWA1000B, EQWA1000D, EQWA1000DC, EQWA1000RB-1A, EQWA1200B-1A, EQWA1200D-1A, EQWA1200DB-1A, EQWA1200DC-1A, EQWA1200RB-1A, EQWA1200RP-1A, EQWM1000.

See Panasonic CTL920F at Kurant store

Panasonic CTL1025F – battery for selected Casio models

The battery CTL1025F / CTL-1025 is used in many older and more advanced Casio solar watches.

Voltage according to product specifications: 1.5 V.

Fits models such as:
AWG100-1A, AWG100BC-1A, AWG100BR-1A, AWG100C-1A, AWG100R-1A, AWG101-1A, AWG101F-4A, AWG101FP-4A, AWG500BJ-8A, AWG500J-1A, AWG500J-9A, AWG525A-1A, AWGM500KG-3A, G101-1AV, G101L-1AV, G101L-2AV, GS1000BJ-1A, GS1000BJ-1A9, GS1000BJ-9A, GS1000D-1A, GS1000J-1A, GS1000J-2A, GS1000RB-1A, GS1100-1A, GS1100-2A, GS1100B-1A, GS1100B-9A, GS1100BR-1A, GS1100D-1A, GW1200A-1AV, GW1200BA-1AV, GW1200BCJ-1A, GW1200BU-1AV, GW1200CJ-1A, GW1200E-1AV, GW1200J-1A, GW1200J-9A, GW1200TDJ-8A, GW1200U-1AV, GW1200U-9AV, GW1201-1AV, GW1201-9AV, GW1201BD-1AV, GW1201C-1AV, GW1201WC-9AV, GW1210A-1AV, GW1210A-2AV, GW1210A-9AV, GW1210BJ-1A, GW1210CE-4AV, GW1210E-2AV, GW1210E-9AV, GW1210U-2AV, GW1210U-9AV, GW1211-2AV, GW1211-9AV, GW1211BD-1AV, GW1300A-9AV, GW1300CE-1AV, GW1300CJ-1A, GW1300E-9AV, GW1310A-2AV, GW1310A-4AV, GW1310BCJ-1A, GW1310E-2AV, GW1310E-4AV, GW1310J-2A, GW1700BTJ-1A, GW1700BTJ-9A, GW1700DE-1AV, GW1700DE-2AV, GW1700DJ-1A, GW1700DJ-7A, GW1700TDJ-8A, GW1701D-1AV, GW1701D-2AV.

See Panasonic CTL1025F at Kurant store

Panasonic CTL621F without contact plate

The battery CTL621 / CTL621F without an additional contact plate is intended for selected solar-powered watches.

Nominal voltage: 2.3 V
Capacity: 5.5 mAh

Modules listed for this product:
346, 1794, 2301, 2364, 5071, 5072, 5170, 705, 7N01, 7N07, 7N08, 7N82, 7N83, 7N89.

See Panasonic CTL621F at Kurant store

CLB3032 – battery for Casio Rangeman GPR-B1000

CLB3032 is the original Maxell / Casio battery intended for selected Casio watches with the Tough Solar system.

Fits models:
GPR-B1000, GPR-B1000-1, GPR-B1000-1B, GPR-B1000TF-1, GPR-B1000TLC-1.

Due to the product's value, the battery is checked, charged, and sealed before shipping. It is recommended to install it at a professional watchmaker's point.

See CLB3032 for Casio at Kurant store

Can you select a Casio battery only by the watch model?

The watch model is very helpful, but if possible, it is worth checking the module number as well. Casio uses the same module in different watch variants, so the module number can be a very good reference point when selecting parts.

Where to find the Casio module number?

In Casio watches, the module number is usually a numerical designation used to identify the electronic mechanism used. When selecting a battery, it is worth noting both the watch model and the module number.

CTL1616F, CTL920F, or CTL1025F – can they be interchanged?

These designations should not be treated as substitutes. They are different types of cells intended for specific watches and modules. Selection should be made based on compatibility with the specific watch.

What to do if the Casio watch battery does not hold energy – does it need to be replaced?

Not necessarily. A solar watch that has been without light for a long time may have a deeply discharged cell. Before replacement, it is worth properly charging the watch and checking its operation.

If, after a full charge, the watch discharges very quickly, the cell may need to be replaced, or the watch may require diagnostics at a watchmaker's service.

Where to buy a battery for Casio Tough Solar?

At the Kurant watch wholesale, batteries for Casio solar watches are available, including popular types CTL1616F, CTL920F, CTL1025F, CTL621F, and CLB3032. Before purchasing, it is best to check the watch model, module number, and the symbol of the original cell.