This 2.3 volt button cell is used in many different model Casio watches. This lithium battery is rechargeable with solar power and it is a high quality replacement battery with a very long life. Some popular Casio models that use the CTL1616 are the Pathfinder, Waveceptor, Atomic and of course the widely popular G-shock line. Also be aware that some of these watches require 2 replacement cells, like some of the Casio Atomics for example.

Specification
Item Performance characteristics
Nominal Voltage (V) 2.3
Charging Voltage (V) 2.5 - 2.7
Nominal Capacity (mAh) 13.0
Continuous Standard Drain (mA) 0.1
Diameter (mm) 16
Height (mm) 1.6
Weight(Approx.) (g) 1.00
Operating temperature (°C) -20 - 60

Compatible Models
CASIO BG800-1V, CASIO BG800-2V, CASIO BG800-6V, CASIO BG800BR-5, CASIO BG800S-8, CASIO BG800S-9, CASIO BG800WH-7, CASIO BG801-1V, CASIO BG801-2AV, CASIO BG801-2BV, CASIO BG801-4V, CASIO BG801-7V, CASIO BG810-1, CASIO BG810-1 (3250), CASIO BG810-1B, CASIO BG810-1B (3250), CASIO BG810-2, CASIO BG810-2B, CASIO BG810-2B (3250), CASIO BG810-4, CASIO BG810-4B, CASIO BG810-6, CASIO BG810L-4, CASIO BG810LV-7, CASIO BG810PD-3, CASIO BG810PD-7, CASIO BGA1000-1B, CASIO BGA1000-7B, CASIO BGR270-2, CASIO BGR270-3, CASIO BGR270-4A, CASIO BGR270-4B, CASIO BGR270-4C, CASIO BGR270-7, CASIO BGR270K-7, CASIO BGR270RF-1, CASIO BGR270RF-5, CASIO BGR271-8, CASIO BGR271L-5, CASIO BGR280-7A, CASIO BGR280-7B, CASIO BGR280-7C, CASIO BGR280-7D, CASIO BGR280V-2, CASIO BGR280V-4, CASIO BGR290-2, CASIO BGR290-7A, CASIO BGR290-7B, CASIO BGR290-7C, CASIO BGR290K-4, CASIO BGR300-1, CASIO BGR300-2, CASIO BGR300-4, CASIO BGR300-7, CASIO BGR3000J-1, CASIO BGR3000J-7A, CASIO BGR3001-4, CASIO BGR3003-1, CASIO BGR3003-7A, CASIO BGR300EB-7, CASIO BGR300EM-2, CASIO BGR300EM-7, CASIO BGR300GR-3, CASIO BGR300PP-4, CASIO BGR300PP-7, CASIO BGR300PV-2, CASIO BGR300PV-4, CASIO BGR302PP-2, CASIO BGR302PP-4, CASIO BGR302PP-7, CASIO BGT1800LJ-1, CASIO BGT1800LJ-7, CASIO BGT2501-2, CASIO BGT2501-3, CASIO BGT2501-4, CASIO BGT2501-8, CASIO BGT2504-4, CASIO BGT2504-9, CASIO BGT2600J-1, CASIO BGT2600J-4, CASIO BGT2601J-4, CASIO BGT3000-2B, CASIO BGT3001-1B, CASIO BGT3001-4B, CASIO BGT3001-8B, CASIO BGT3002LJ-5A, CASIO BGT3002LJ-8A, CASIO BGX220-3, CASIO BGX220-4C, CASIO BGX220K-2, CASIO BGX220V-2AV, CASIO BGX220V-2BV, CASIO BGX220V-8V, CASIO BGX221-2AV, CASIO BGX221-2BV, CASIO BGX221-2CV, CASIO BGX221-3V, CASIO BGX221-4AV, CASIO BGX221-4BV, CASIO BGX221-4CV, CASIO BGX221-8V, CASIO BGX230V-2, CASIO BGX230V-3, CASIO BGX230V-4A, CASIO BGX230V-4B, CASIO BGX240K-2, CASIO BGX240TC-1, CASIO BGX240TC-8, CASIO BGX240V-1, CASIO BGX240V-2, CASIO BGX240V-2V, CASIO BGX240V-4A, CASIO BGX240V-4AV, CASIO BGX240V-4B, CASIO BGX240V-4BV, CASIO BGX240V-4C, CASIO BGX240V-4CV, CASIO BGX250V-2, CASIO BGX250V-3, CASIO BGX250V-4, CASIO BGX250V-5, CASIO BGX260-1, CASIO BGX260-2A, CASIO BGX260-2B, CASIO BGX260-4, CASIO BGX260-5, CASIO BGX260V-1, CASIO BGX260V-2, CASIO BGX260V-7, CASIO BGX261-7, CASIO BGX261-9, CASIO DB310GA-1, CASIO DW6900MS-1, CASIO DW6900MS-1 (3230), CASIO EQB500D-1A, CASIO EQB500DC-1A, CASIO EQB500RBK-1A, CASIO EQB510D-1A, CASIO EQB510RBM-1A, CASIO EQW700DBJ-1A, CASIO EQW700DBY-1AV, CASIO EQW700DCY-1AV, CASIO EQW700DY-1AV, CASIO EQW700DY-2AV, CASIO FTW100D-7V, CASIO G2800-1, CASIO G2800-2, CASIO G2800-8, CASIO G2800B-1V, CASIO G2800B-2V, CASIO G2800B-8V, CASIO G2800BC-1, CASIO G2800EV-8, CASIO G2800GH-8, CASIO G2800K-2, CASIO G2800MA-2V, CASIO G2800MA-3V, CASIO G2800MA-4V, CASIO G2800MA-9V, CASIO G2800RE-3, CASIO G2801BC-1, CASIO G5500-1, CASIO G5500AL-1, CASIO G5500B-1, CASIO G5500C-3, CASIO G5500C-4, CASIO G5500C-7, CASIO G5500JC-4, CASIO G5500JC-9, CASIO G5500MC-5, CASIO G5500MC-8, CASIO G5500R-1, CASIO G5500SRF-2, CASIO G5500TS-8, CASIO G5500TS-9, CASIO G5500US-3, CASIO G550FB-1A3, CASIO G550FB-1A4, CASIO G550FD-1A, CASIO G5600-1, CASIO G5600-9, CASIO G5600A-3, CASIO G5600A-7, CASIO G5600A-9, CASIO G5600B-1, CASIO G5600CC-2, CASIO G5600CC-3, CASIO G5600E-1, CASIO G5600EB-2, CASIO G5600EV-8, CASIO G5600GH-8, CASIO G5600GR-7, CASIO G5600K-7, CASIO G5600KG-3, CASIO G5600LL-4, CASIO G5600NV-2, CASIO G5700-1, CASIO G5700-9, CASIO G5700GH-8, CASIO G5700RF-1, CASIO G6900-1, CASIO G6900B-1, CASIO G6900CC-1, CASIO G6900CC-6, CASIO G6900EB-2, CASIO G6900EW-7, CASIO G6900GR-3, CASIO G6900KG-3, CASIO G7210-1V, CASIO G7210-2V, CASIO G7210K-7A, CASIO G7210K-7B, CASIO G7300-1V, CASIO G7300-2V, CASIO G7300D-8V, CASIO G7300RF-1, CASIO G7301-3V, CASIO G7301-8V, CASIO G7301B-3V, CASIO G7301B-8V, CASIO G7301D-8V, CASIO G7301G-9V, CASIO G7301L-1V, CASIO G7301V-1V, CASIO G7301V-8V, CASIO G7302RL-1AV, CASIO G7302RL-1V, CASIO G7302RL-2V, CASIO G7302RL-4V, CASIO G7302RL-7V, CASIO G7400-1V, CASIO G7400-8AV, CASIO G7400-8BV, CASIO G7400A-2V, CASIO G7400A-4V, CASIO G7400A-9V, CASIO G9010-1, CASIO G9200-1, CASIO G9200BL-2, CASIO G9200BP-1, CASIO G9200BW-1, CASIO G9200ER-3, CASIO G9200GY-1, CASIO G9200MS-8, CASIO G9200R-4, CASIO G9300-1, CASIO G9300ER-5, CASIO G9300GB-1, CASIO G9300GY