Battery costs continue to drop on a per-kWh basis, from $790 in 2013 to a record low $139 now, according to a survey by research firm BloombergNEF. A drop in the cost of raw materials and a ...

When your iPhone battery drops to 20%, your phone will ask if you'd like to switch to Low Power Mode. If you need to stick it out just a little longer with the juice that you have, this is a good ...