{"product_id":"polmar-db-2-replacement-battery-37v-1100mah-li-ion","title":"Polmar DB-2 PB-2 Compatible Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePolmar DB-2 — 3.7V Li-ion Replacement Battery (PB-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1100mAh Li-ion replacement for the Polmar DB-2 two-way radio, using OEM part number PB-2. It slots into the DB-2 battery compartment and restores full transmit and receive capability. Capacity matches the original pack at 1100mAh (4.07Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDB-2 platform fit:\u003c\/strong\u003e\n    The DB-2 runs a single-cell 3.7V Li-ion architecture with a compact form factor — 53.00 x 33.90 x 5.70mm. The PB-2 pack shares that exact footprint and voltage rail, so the radio's BMS handshake completes without reconfiguration.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through PTT transmit loads on the DB-2 and monitored BMS response. The protection circuit held cutoff thresholds correctly under both sustained transmission and standby draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on the charger dock:\u003c\/strong\u003e\n    New cells ship at storage voltage, not full charge. If the dock shows a fault indicator on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The DB-2 dock requires a clean contact cycle to accept the BMS handshake before charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDB-2 bar indicator showing one fewer bar than expected on a new PB-2\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-ion cells arrive at storage voltage — typically 3.6V to 3.7V — not at full charge. The DB-2 uses a voltage-threshold bar indicator, so a cell sitting at storage voltage reads as one bar below full. This is not a cell fault. Place the pack in the charger until the dock confirms a complete charge cycle, and the indicator will reflect actual cell voltage correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDB-2 cuts out mid-transmission on a freshly charged PB-2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003ePTT transmit draws a sharp current spike — significantly higher than standby draw. If the BMS protection circuit trips an overcurrent threshold during that spike, the radio drops power mid-transmission. This can happen when contact resistance is high due to dirty terminals on either the pack or the radio. Clean the gold contacts on both the PB-2 and the DB-2 battery bay with a dry cloth, confirm they seat flush, and attempt transmission again — contact resistance should drop below the BMS trip threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426293088346,"sku":"BWCS-TMR446TW-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426293121114,"sku":"BWCS-TMR446TW-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426293153882,"sku":"BWCS-TMR446TW-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMR446TW-1.webp?v=1779930602","url":"https:\/\/batteryweb.com\/products\/polmar-db-2-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}