Telecom & 5G site backup
A telecom backup battery sits at full charge for weeks, then has to deliver its full rated current for hours in a cabinet that reaches 55 °C in summer. That duty destroys lead-acid and shapes how a lithium pack must be specified.
The duty cycle is unusual
A telecom backup battery is not cycled daily. It floats at full charge for long periods, then discharges at high current when the site loses supply, then recharges quickly when power returns.
That profile puts two demands on the pack that a solar or mobility application does not:
- Standing at high state of charge in heat. Calendar ageing at high state of charge and high temperature is the dominant degradation mechanism, and it is why cell selection and charge voltage management matter more here than cycle life.
- Fast recharge at full current. Sites are often required to be ready for a second outage within a few hours, which means a high charge current and the thermal management that goes with it.
Temperature derating is a feature, not a limitation
A pack that limits its own charge current as the cabinet heats up is protecting itself. The alternative — charging at full current into cells at 55 °C — is how a three-year life becomes an eighteen-month life and how a fleet replacement programme becomes unaffordable.
If your specification has a firm recharge-time requirement, tell us the cabinet's summer internal temperature. We will size the pack and the charge current so the requirement is still met under temperature derating rather than only on a bench at 25 °C.
Legacy integration
Many sites run rectifiers and controllers that predate lithium batteries entirely. Where no protocol documentation exists, we reproduce the interface by capturing the register traffic on a bench rig with the customer's own hardware — slower than working from a document, but the only reliable route, and better done in our lab than on a live site.