About this replacement
HILTI TE 5 A / C 7/24 / C 7/36 — 24V Ni-MH Replacement Battery (BP60 / BP72)
This is a 24V 2000mAh Ni-MH replacement battery for the HILTI TE 5 A rotary hammer and the C 7/24, C 7/36, and TCU 7/36 cordless tools. It replaces OEM packs BP60 and BP72. The pack slots directly into the original battery bay and communicates with the tool's onboard electronics.
- TE 5 A, C 7/24, C 7/36, TCU 7/36 compatibility: These four tools share the same 24V battery rail, connector footprint, and BMS handshake protocol — which is why one pack covers all of them. Swapping between models on the same jobsite is straightforward.
- Bench tested on actual hardware: We cycled this pack through repeated trigger-pull events on a TE 5 A and monitored BMS response to inrush current spikes. The overcurrent protection tripped at the expected threshold and recovered cleanly without latching in a fault state.
- Motor-start conditioning on first use: On the first two uses, run the TE 5 A at half load — light drilling only, no hammering through dense concrete. This lets the BMS log the actual inrush current curve for your specific tool before it sets its overcurrent protection thresholds.
BMS cutoff on the TE 5 A motor-start inrush surge
Rotary hammer drills pull a large current spike the instant the trigger is pulled — often two to three times the steady-state draw. The BP60/BP72 BMS is calibrated to allow that inrush window, but a pack that has sat in storage may have cell voltage slightly below the tool's acceptance floor. The BMS then reads the inrush as an overcurrent event and shuts down before the drill even starts spinning. Fully charge the pack to 24V before the first use and run a light conditioning cycle to reset the protection threshold.
Tool bogs under load mid-drill and feels underpowered
If the TE 5 A starts strong but loses torque partway through a hole, voltage sag is the likely cause — not a dead pack. High resistance at the battery contact rail drops the voltage under sustained motor load, starving the tool before the cells are depleted. Clean the battery terminals and the tool's contact strips with isopropyl alcohol and check for corrosion or debris. If rail voltage reads below 21V under load, the contacts need mechanical attention before swapping the pack again.