The battery for my Series S17 has stopped working within the warranty period. Got a replacement battery, which stopped working 10 days later altogether. The quality of these batteries left me wanting - but I must applaud the customer service received though all of this. Jacvapour (shoutout for Duncan!) has been quick to reply and to send replacements as soon as possible after assessing the situation, and has been both warm and understanding in their communications! This is exemplary customer service - keep up the great work!