About this replacement
Hytera AP510 / AP515 Series — 3.7V Li-Polymer Replacement Battery (BP4010)
The BP4010 is a 3.7V, 4000mAh Li-Polymer battery for the Hytera AP510, AP515, and AP515LF portable digital radios. These are professional land mobile radios used in public safety, security, and enterprise environments where communication uptime is non-negotiable. Voltage and capacity match the original Hytera specification exactly.
- AP510, AP515, and AP515LF compatibility: All three models share the same battery bay geometry, contact pin layout, and BMS handshake protocol. One pack covers the full AP5-series platform without any modification.
- Bench tested on actual hardware: We ran this pack through charge cycles on the AP510 using a Hytera dock. The BMS accepted the handshake on first insertion, voltage held steady under simulated PTT draw, and the charger progressed normally through to termination.
- First-insertion contact check on Hytera docks: If the dock shows a fault LED on first seating, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The AP5-series dock reads BMS data on contact before allowing charge to begin — a marginal connection on first use is the most common reason a new pack appears rejected.
Why the AP510 cuts out or drops TX power mid-transmission on a new BP4010
Li-Polymer cells ship at storage voltage — typically 3.6V to 3.75V — not at a full charge. On the AP510, the RF output stage draws a spike of current the moment PTT is pressed. If the cell hasn't completed at least one full charge cycle, internal impedance is slightly elevated and voltage can sag enough under that transmit spike to trigger the BMS overcurrent cutoff. The radio either drops to reduced TX power or cuts out entirely. Run a full charge cycle on the dock before putting the pack into service and the cutoff threshold won't be reached during normal transmit bursts.
Bar indicator showing one fewer bar than expected after inserting a new BP4010
The AP510 uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a tracked charge state. A new pack arriving at storage voltage of roughly 3.65V to 3.70V will sit at the boundary of the lower bars, so the display shows one or two bars even on a cell that is not depleted. This is not a fault with the pack. Place it on the dock for a full charge cycle until the charge indicator clears, then reinsert — the bar indicator will read correctly against the fully charged cell voltage.