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Amazon.com offers the IOGear JuiceMeter Portable Battery Tester, model no. GBT001W6, for $1.40 plus $2.98 for shipping. (BuyDig.com charges one cent more.) That's the lowest total price we could find by $4, although it was a buck less in November (since expired). This tester features an easy-to-read gauge and works with disposable as well as rechargeable batteries.