These batteries work great in my flashlights, awesome runtime. Nickel batteries such as these must be used soon after pulling off the charger. In a 4-C cell flashlight, fresh batteries inserted from the charger on Friday will not turn the light on on Monday due to normal self-discharge. This is expected for NiMH batteries of this capacity. The PowerEx low self-discharging (LSD) batteries are alternate good choices if you need shelf life.