About this replacement
Televes H45 / H60 — 7.4V Li-ion Replacement Battery (9920)
This 7.4V 10400mAh Li-ion battery replaces the OEM pack in the Televes H45 and H60 field strength meters. These are professional RF and TV signal analysis instruments used in broadcast installations and network site surveys. The battery slides into the same bay as the original 9920 pack and connects via the same BMS-managed interface.
- H45 and H60 compatibility: Both meters share the same battery bay geometry, connector pinout, and BMS handshake protocol — that is why one pack covers both models. The H60 runs the same 7.4V voltage rail and draws through the same charge management circuit as the H45.
- Bench tested on actual hardware: We cycled this pack through the H45 boot sequence, full RF scan routines, and USB data export to a connected PC. The BMS held stable under the combined draw of the display, tuner module, and active USB transfer without tripping a protection cutoff.
- First-use calibration step: After fitting this battery, run a full calibration cycle through the instrument's system menu before heading out on site. The H45 and H60 map battery state during that calibration pass — skip it and the fuel gauge will flag low battery warnings well before the cell is actually depleted.
BMS cutoff when the H45 initialises its tuner module at startup
The H45 tuner module pulls a short current spike the moment it powers up — enough to trip the overcurrent threshold on a weakened or cold BMS. This is not a fault in the instrument; it is a protection response in the battery pack. A new pack with a fully conditioned BMS handles this spike without cutting out. If the meter shuts down in the first two seconds of boot, check that the battery terminals are clean and the pack is above 7.0V before retrying.
Pack shows charged but H45 reboots mid-logging session
This usually happens when the cell voltage sags under sustained tuner and display load, dropping far enough to trigger the meter's undervoltage reset — even if the indicator showed a healthy charge beforehand. The H45 samples battery voltage at a fixed polling interval, so a fast voltage dip between samples can look like a full charge right up until the moment the unit resets. This is more common with older or partially degraded cells. Replace the pack and confirm open-circuit voltage sits at or above 8.2V before starting a logging session.