08/18/2026
***Safety Notice: Aging Lithium-Ion Backup Batteries Are a Growing Risk***
Check Your Backup Batteries. Many homes and small businesses now rely on lithium-ion battery packs to keep internet gateways, Optimal Network Terminals (fiber terminals), and phone equipment running during a power outage. Like all lithium-ion batteries, these packs carry a fire risk if they are damaged, aged, or left unchecked.
Lithium-ion batteries degrade over time. A pack that once charged and protected reliably can develop internal faults as it ages — faults that don't always show obvious warning signs until it's too late. Aging, neglected packs left in continuous trickle-charge service are one of the more common paths to battery failure.
Guidance for Battery Packs
If your equipment uses a battery pack (commonly used as ISP/telecom backup power, including battery backup kits):
• Typical service life is about 1 year. These packs are not intended to last indefinitely — plan to replace on this schedule even if the pack still appears to be working.
• Inspect every 3 months for signs of damage, leakage, or swelling. Remove and safely dispose of any battery showing these signs immediately.
• Check charge level every 6 months at minimum.
General Warning Signs — Any Lithium-Ion Battery Stop using and safely isolate any battery that shows:
• Swelling, bulging, or a warped case
• An unusual smell (sweet, chemical, or "off")
• Excessive heat during charging or use
• Leaking or discoloration
• Hissing or crackling sounds