{"product_id":"sony-cyber-shot-dsc-t20b-replacement-battery-37v-1000mah-li-ion","title":"Sony Cyber-shot NP-BG1 Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Cyber-shot DSC-T20\/B Series — 3.7V Li-ion Replacement Battery (NP-BG1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion replacement for the Sony NP-BG1 and NP-FG1 battery. It fits the Cyber-shot DSC-T20\/B and over 130 other Cyber-shot compact cameras including the DSC-W215, DSC-W40, and DSC-W55. Dimensions are 41.90 × 35.40 × 8.10mm — same form factor as the OEM cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCyber-shot G-type slot compatibility:\u003c\/strong\u003e\n    Sony's NP-BG1 and NP-FG1 share the same physical connector and voltage rail. The BMS on these Cyber-shot bodies uses a single-wire handshake over the centre pin. Both part numbers clear that handshake on the DSC-T20\/B, W215, and W40 platforms.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the DSC-T20\/B body. The BMS accepted the cell on first install, charge termination triggered correctly at 4.2V, and the camera's battery indicator mapped consistently across the full discharge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge cycle on the T20\/B:\u003c\/strong\u003e\n    Charge this battery from inside the camera body using Sony's OEM charger or the body's USB port before your first shoot. The DSC-T20\/B calibrates its battery-remaining display from the charge profile it reads during that first cycle — skipping this step causes the indicator to read incorrectly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFlash capacitor recharge sag at the end of the cell's discharge curve\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DSC-T20\/B's flash capacitor draws a sharp current spike to recharge between shots. Near the bottom of the battery's discharge curve — below roughly 3.5V — the cell's internal resistance rises enough that this spike causes a brief voltage sag. The camera body reads that sag as a low-battery condition and may cut the flash or shut down before the indicated charge reaches zero. This is normal cell behaviour, not a fault in the replacement battery.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after inserting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a discharge curve that doesn't yet match the voltage-threshold map stored in the camera's fuel gauge logic. The T20\/B reads voltage at rest and estimates percentage from a fixed lookup table — a fresh cell at partial charge can sit at a voltage that maps to a different percentage than expected. Complete one full charge-to-discharge cycle in the camera body. After that cycle, the indicator tracks the new cell's curve accurately and the jumping stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333916852314,"sku":"BWCS-BG1-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333916885082,"sku":"BWCS-BG1-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333916917850,"sku":"BWCS-BG1-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BG1-1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/sony-cyber-shot-dsc-t20b-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}