Freebie Tip Of The Week From INTEGRA
Are you using the Intermatic DT620 Digital Astro timers and sick and tired of replacing batteries in them? Well that is because they ship with LR44 batteries that are an el-cheapo, standard alkaline battery that drops voltage in constant low draw applications. They also have a very low tolerance for freezing.
Instead you can upgrade to an SR44 battery. This is a Silver Oxide version, same voltage, same size, but lasts much longer. Hunt around online for the best prices.