I am writing in this way to all those who want to replace their used batteries in smoke detectors. I myself have in my household 8 smoke detectors for 12 years operation. Battery replacement is recommended by the manufacturers usually after 12 months. Because if you stick to this recommendation, the battery change with brand batteries to an expensive affair. Therefore, I have documented over a period of about 8 years to replace the battery in my smoke detectors. They managed to achieve brand batteries as well as batteries of discounters in this period. The experience I have gained here have, but really surprised me because the batteries of discounters the brand batteries were second to none. Even the recommended change in a period of 12 months could be partly extended to up to 24 months. Conclusion: For smoke alarms you do not need expensive brand batteries. The double packs from discounters for a price of less than 2, - do it, even if you stick to the 12-month recommendation.
