Walmart offers the Everstart Multi-Function Jump Starter and Battery Charger, model no. TL9608, bundled with the Auto Drive 3-Foot Micro USB Cable, model no. BCE2000W, for $31. Choose in-store pickup to dodge the $4.97 shipping fee. That's $6 under the lowest price we could find for the charger alone elsewhere. (For further comparison, we saw the charger alone for $29 three weeks ago.) This 12,000mAh lithium battery functions as a jump starter, flashlight, or emergency cellphone charger.