There is herein provided an uninterruptible power supply device with a degradation judgment circuit of a storage battery which can perform an exact judgment, continuing the power supply to a load apparatus stably without giving the excessive burden to the storage battery. The storage battery is floatingly...http://www.google.com.au/patents/US7759822?utm_source=gb-gplus-sharePatent US7759822 - Uninterruptible power supply device with circuit for degradation judgment of storage battery
