It looks like you're referring to several mobile phone batteries and models that are compatible with various Sony Xperia smartphones. Here’s a summary of what each part number and model corresponds to: LT29i: This is the model number for the Sony Xperia TX. ST26: This refers to the Sony Xperia TX, which uses this specific battery. C2104 / C2105: These are the model numbers for the Sony Xperia C. AB-0500: This could be a part number, possibly an internal code used by a manufacturer or retailer to identify a compatible battery, but it’s less common in public listings. BA900: This is the Sony Xperia J and Xperia L battery model.
Battery Compatibility Overview:Sony Xperia TX (LT29i): Uses the ST26 battery (1700mAh, 3.7V). Sony Xperia J and Xperia L: Use the BA900 battery (1750mAh, 3.7V). Sony Xperia C (C2104, C2105): Likely uses a battery similar to the ST26 or another variant depending on the specific model.
If you're replacing the battery, be sure the model numbers and battery specifications (voltage, capacity, and size) match your device to ensure proper compatibility.        
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