{"product_id":"caltta-e350-echat-poc-replacement-battery-38v-4000mah-li-polymer","title":"Caltta E350 EChat POC Replacement Battery 3.8V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCaltta E350 EChat POC — 3.8V Li-Polymer Replacement Battery (F73001A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 4000mAh Li-Polymer battery is a direct replacement for the Caltta E350 EChat POC, a push-to-talk over cellular (PoC) portable radio. It fits the E350 EChat POC platform and carries OEM part number F73001A. Voltage and capacity match the original pack specification from Caltta.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE350 EChat POC platform fit:\u003c\/strong\u003e\n    The E350 uses a 3.8V Li-Polymer cell with a BMS tuned to PoC transmit current profiles — brief but repeated spikes as PTT is pressed over a cellular data session. This replacement pack uses the same voltage rail and connector geometry as the F73001A original, so the BMS handshake completes on first boot without manual configuration.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated PTT transmit events on the E350 bench unit. The BMS handled transmit current spikes without triggering overcurrent cutoff, and the radio held its cellular registration throughout each test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the E350 charger dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The E350 dock requires a clean contact cycle to accept the new BMS handshake before it begins the charge cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the E350 EChat drops to reduced TX power mid-shift on a new pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePoC radios draw current in short, sharp bursts each time PTT opens a voice session over the cellular network. If cell impedance is high — common in a new pack that shipped at storage voltage — the voltage rails sags under that burst load and the radio steps down transmit power to protect the RF module. This is not a faulty battery. Running two or three full charge-discharge cycles brings cell impedance down and eliminates the sag. After conditioning, the pack holds voltage under PTT load and TX power returns to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a freshly charged F73001A\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-Polymer cells ship at roughly 3.6–3.7V — storage voltage, not full charge voltage. The E350 reads voltage thresholds to set the bar indicator, so a pack at storage voltage correctly displays one bar fewer than a fully charged cell. This is not a capacity fault. Seat the pack in the dock and run a complete charge to 4.2V per cell before drawing conclusions about indicator accuracy. After a full charge cycle, the bar indicator will read as expected.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426185019482,"sku":"BWCS-ZPE350TW-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426185052250,"sku":"BWCS-ZPE350TW-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426185085018,"sku":"BWCS-ZPE350TW-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZPE350TW-1.webp?v=1779930459","url":"https:\/\/batteryweb.com\/products\/caltta-e350-echat-poc-replacement-battery-38v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}