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If you require an increase in run-time, longer life, and faster charging, you might want to take a look at this Milwaukee 48-59-2003 Redlithium USB Battery and Charger Kit. This kit has a 3X faster charge time with over 2,000 recharges. It can fully charge a battery in 2 hours, 80% charge under 1hour, and 50% of charge under 30mins for you to have a more efficient time during an operation. Also, it has 2X more capacity compared to 3 AAA alkaline batteries. The charger stores the battery when not in use. Do more while spending less