Battery discharge

Times have rear reingeguckt after about 4 years, just in time almost. Battery ran out, could still with knife marks scrape away the inside. One need not necessarily Quanty battery, other rechargeable go well. But you need a charger. Is the battery fully, kanns go farther. Well, it's to illuminate the solar cell down often times, whether sun or artificial light. But a battery (unaufladbar)
I would not reinsetzen, is specially in the battery compartment: Use only rechargeable battery. Otherwise, I'm very pleased with the alarm clock.