Long-life lithium batteries with an “˜end-of-life’ indication


Port Washington, NY, U.S.A. — (METERING.COM) — August 23, 2007 – Tadiran Batteries, a manufacturer of lithium batteries, has just introduced an improved version of its PulsesPlus™ battery that allows for an indication at end-of-life, allowing end users to maximize the service life of the original battery while at the same time ensuring continuous service through scheduled battery replacements.

Lithium thionyl chloride batteries are typically used in applications where battery replacement or recharging is either impossible or extremely difficult, such as automatic meter reading and wireless remote sensors. In addition to being non-replaceable, batteries suited to these applications must perform reliably in very harsh environments, and provide an operating life of up to 20 years.

While lithium thionyl chloride cells operate at a very stable voltage over almost their entire operating lives, the lack of a drop in voltage over time has not allowed for an indication of battery state of charge. In many cases, batteries are replaced prematurely based on estimations of amount of remaining battery life, even though the cells could continue to operate for years to come. By contrast, PulsesPlus batteries offer the potential for end-of-life indication. The new improvements come in two distinct families:

  1. 3.6v system with a 5% end-of-life indication (when the battery uses up 95% of its capacity, a remote indicator can advise the end users that 5% of operating life remains)
  2. 3.9v system with a 10% end-of-life indication.

Utilities using AMR systems designed with a 20 year operating life will no longer have to replace their meters after 15 years to avoid system downtime. Based upon the PulsesPlus system they chose, they will be notified 1 or 2 years before the battery reaches its end-of-life – providing more than enough time to schedule replacements. This will allow longer operating time for devices and save on replacement costs.

Maintenance trips to remote sensing devices will also be less frequent and system reliability will improve.