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From Fellrnr.com, Running tips
→MYO RXP Battery Life
* On setting #10, the light will start giving out 140 lumens, but it will immediately start to grow gradually dimmer. This drop in light level will be gradual enough that it will not be immediately detectable.
* The actual battery life will depend on the batteries used and the temperature. The chart is for fresh alkaline batteries at 68f/20c, and cold weather can reduce the battery life quite a bit. Lithium batteries will last longer and rechargeable batteries will last for less time.
* The claimed battery life matches up with my experiences. I use the [http://go.fellrnr.com?id=35454X937677&xs=1&xcust=enloop&url=http%3A%2F%2Fwww.amazon.com%2FSanyo-eneloop-Pre-Charged-Rechargeable-Batteries%2Fdp%2FB004SB1TD4 Enloop Low Self Discharge rechargeable batteries], so I get slightly less runtime than indicated, but it's close.
[[File:Petzl MYO XP Regulation.jpg|none|thumb|600px|This is the chart of settings for the RXP. You can only have three levels programmed in, but you have quite a variety to choose from.]]
