I ordered the new Magicshine replacement battery. The runtime with a full charge hooked up to my tail light and headlight was pretty dismal. I normally got 3 mornings from my old battery and using the new one this morning the light on the back of the headlight indicating the battery getting low was on after only riding for 37 minutes. I was running it on the high beam but that's how I ran the other light and it would go 3 mornings with out recharging. NOT IMPRESSED.