{"product_id":"tetra-sc20-replacement-battery-74v-3300mah-li-ion","title":"TETRA SC20 Replacement Battery 7.4V 3300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTETRA SC20 \/ STP9000 Series — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 3300mAh lithium-ion battery replaces the original pack in the TETRA SC20, STP9000, STP9040, STP9200, and compatible variants in the same platform family. It fits the same battery bay and connects to the same contact strip used across this TETRA TETRA series. Voltage and capacity match the OEM specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSC20 and STP9000-series platform fit:\u003c\/strong\u003e\n    The SC20, STP9040, and STP9200 share the same battery form factor, contact layout, and BMS handshake protocol. One pack covers the full platform because the voltage rail and connector footprint are common across these TETRA models.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack in an SC20 dock and monitored the BMS initialisation cycle. The protection circuit accepted the charge current without tripping, and the radio recognised the pack and moved through all bar indicator states as expected under load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the dock:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TETRA platform requires a clean contact cycle before the dock accepts the new BMS handshake and begins charging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SC20 cuts out mid-transmission on a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDuring PTT, the SC20 draws a short, sharp current spike to power the RF output stage. If the BMS interprets that spike as an overcurrent event, it trips and disconnects the cell — dropping the transmission instantly. This is more common at storage voltage, where internal impedance is slightly elevated and the BMS threshold is easier to hit. The fix is to seat the pack in the dock and let it charge to at least 7.0V before first use, which lowers impedance and brings the spike within the BMS acceptance window.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNew cells ship at storage voltage — typically around 3.6–3.7V per cell, or roughly 7.2–7.4V for the pack. The SC20's voltage-threshold bar indicator reads that as one bar below full, which looks like a fault but is not. A full charge cycle brings the pack to approximately 8.4V, and the indicator will move to the correct level. Do not return the pack before completing one full charge from the dock.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426297643098,"sku":"BWCS-SPR803TW-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426297675866,"sku":"BWCS-SPR803TW-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426297708634,"sku":"BWCS-SPR803TW-3","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SPR803TW-1.webp?v=1779930602","url":"https:\/\/batteryweb.com\/products\/tetra-sc20-replacement-battery-74v-3300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}