Featured with a Microprocessor Controller Design and built-in AVR, the AP Series not only provides reliable power protection but also provides clean power for your electronic equipment. The Buck & Boost AVR function corrects either under-voltage or over-voltage conditions without unnecessary battery drainage and extends the life of the battery. With a built-in powerful charger, the UPS can be fully charged back to 90% within 6-8 hours. The battery may be charged continuously even though it is in the OFF mode.