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ITFrequently Asked Questions · UPS
How long do UPS batteries take to charge?
Before first use: charge for at least 8 hours. After first use: a full charge takes 4-6 hours, depending on capacity.
Charging time depends on the battery capacity and on the power of the UPS charger. Built-in chargers are relatively small so that they charge gently and protect battery life. That is why units with external battery packs for long runtime need proportionally more hours, or an additional charger.
The first, longer charge is needed because batteries self-discharge during storage and transport. The UPS can power your devices from the start, but until charging is complete the runtime during an outage will be shorter than expected.
Keep in mind, too, that charging is not linear: most of the capacity is restored relatively quickly, while the last part takes longer. If a second outage follows soon after the first, the available runtime may be limited.
Practical tip: do not run a runtime test right after installation. First leave the UPS connected to the mains for as long as the initial charge requires, so the measurement is reliable and you do not needlessly deep-discharge brand-new batteries.