Nobody likes it when their smartphone gives them that low-battery warning. This website (by electronics retailer LiGo) has model specific tips for a huge number of smartphones from Apple, Samsung, Blackberry, HTC, Huawei, LG, Motorola, Sony, Nokia, and even Amazon.
Everything is nicely sorted in drop-down menus. Simply pick the manufacturer, then the model and check the tips to find ways to keep your device humming along and available for use when you need it most. The latest and most popular models are there as well as the many older models and sleepers that tend to have less coverage and fewer tips posted about them.