Need more power for your smartphone than what your current battery offers? This is a great deal on an external battery for your smartphone that’s compatible with a whole bunch of smartphones (see here for list) and is now on sale for just $39.99. That’s a 60% discount off the regular price of $99.99 and a $60.00 savings off full price for this battery charger from Anker. Don’t miss out on this Battery Charger deal for your smartphone.