hello I need your guys help with this. I bought my gf her 38mm sport watch and her batter life seems terrible. From a 100% charge and at 48 mins of usage it's down to 87%. She starts her day at 6am and it's at 10% at 3pm. Any tips on this? She's also tried to turn something's off to improve but I feel her battery is no as strong as its supposed to be. Thank you in advance for your input