BatteryJack inc.
BatteryJack inc. HC1221W 12 Volt 5.1 Amp Hour battery
12 V 5.1 Ah sealed AGM battery replaces HC1217W in APC and Belkin UPS units
- AGM technology delivers maintenance-free operation
- 12 Volt 5.1 Amp Hour capacity provides 21 Watts of power
- Direct replacement for HC1217W ensures 100% compatibility
- Fits APC Back-UPS and Belkin UPS models listed
- Sealed design with 4-7 year expected service life
Replacement 12 V 5.1 Ah battery
This 12 volt, 5.1 amp hour battery replaces the HC1217W and delivers 21 watts of capacity. It is built with advanced AGM technology and arrives fully sealed and maintenance free. The unit serves as a 100 percent OEM replacement for compatible UPS and backup devices. It is intended for users who need a direct drop-in cell for listed APC, Belkin, CyberPower and CSB models.
Recessed terminals and compact footprint
The battery measures 5.51 inches long, 1.89 inches wide and 4.0 inches high with recessed terminals that fit the original mounting brackets. Its sealed AGM construction means no fluid checks or top-ups are required during its service life. The form factor matches the HC1221W footprint so installation proceeds without modification to the host chassis. Buyers who need front-access terminals or a larger capacity cell will need a different model.
4 to 7 year expected service life
The manufacturer rates the expected battery life at four to seven years depending on application and temperature conditions. A three year warranty covers UPS and backup use while other devices carry a two year warranty. This life rating is the key figure for deciding whether the cell matches your replacement schedule. Users who require a longer rated lifespan should consider alternative chemistries.
Highlights
- AGM technology delivers maintenance-free operation
- 12 Volt 5.1 Amp Hour capacity provides 21 Watts of power
- Direct replacement for HC1217W ensures 100% compatibility
- Fits APC Back-UPS and Belkin UPS models listed
- Sealed design with 4-7 year expected service life
Specifications
No published specifications for this item yet.
Questions about this item
What voltage and capacity does the HC1221W deliver?
The battery supplies 12 volts and 5.1 amp-hours, rated at 21 watts for UPS and backup applications.
Will the HC1221W fit in the same space as my old HC1217W?
Yes, it measures 5.51 inches long, 1.89 inches wide and 4.0 inches high, matching the recessed footprint of the HC1217W.
How do I install the HC1221W in my APC Back-UPS and what step is often missed?
Disconnect power, remove the old unit, insert the new battery with terminals facing the same orientation, then reconnect the leads — the step many skip is tightening both terminal bolts to the same torque.
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