Review on Ztylus Stinger Car Emergency Escape Tool: Life-Saving Rescue Phone Charger Adapter with Window Breaker, Seatbelt Cutter, 2 USB Ports Max 2.4A - Perfect Christmas Gift Idea (Black) by Christopher Scales

Lifesaver (if you know what I mean, for example when the battery is dead and needs to be charged, but you forget your portable charger or don't have one at all) ! In addition to the mentioned weak battery, it can also cut through a seat belt (which I've tested on thick fabrics and works pretty well) and shatter glass (which I haven't tested). This product would be a great addition to your car or maybe even an EDC in your backpack, purse or whatever. In the end it's worth it!