In a UPS the battery does not need to run for hours; it has to release a lot of energy in a short time so the computer can save its work and shut down cleanly. According to the maker, the HR1221WF2 is designed for exactly this kind of high-efficiency discharge. The listed 21 W is the rated power, not a capacity in amp-hours, which the manufacturer does not specify.
UPS owners whose battery has worn out and holds up the load for less and less time; IT staff replacing batteries in several office UPS units with one model; and anyone whose old battery is labelled HR1221WF2 or whose UPS manual names this model.
| Brand | CSB Battery |
|---|---|
| Capacity | 21 W |
| Net weight | 1.80 kg |
| Special features | HR 1221WF2 is specially designed for high efficient discharge application. Its characteristics are small volume, light weight and high discharge efficiency |
| EAN | 2000001340691 |
The safest way is to compare the label on the old battery: if it reads CSB HR1221WF2 or your UPS manual names this model, the battery fits. The manufacturer does not specify dimensions or terminal type.
It is the rated power the battery can deliver during high-rate discharge. Do not confuse it with amp-hours, which describe capacity.
It depends on the UPS: some models use a single 12 V battery, larger ones several in series. Check how many are in the old unit and replace them all at the same time.
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