{"product_id":"tatung-tnb5600-replacement-battery-12v-3800mah-ni-mh","title":"Tatung TNB5600 Replacement Battery 12V 3800mAh DR36","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTatung TNB5600 \/ TNB5500 — 12V Ni-MH Replacement Battery (DR36)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 3800mAh (45.6Wh) Ni-MH replacement battery for the Tatung TNB5600 and TNB5500 notebook computers. It replaces OEM part numbers DR36 and DR36S. Install it when the original cell no longer holds a charge or the laptop won't run on battery power at all.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTNB5600 and TNB5500 compatibility:\u003c\/strong\u003e\n    Both models share the same 12V battery rail, connector pinout, and BMS handshake protocol, which is why a single cell covers both. The DR36 and DR36S are interchangeable references to the same physical unit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the TNB5600 platform. The BMS accepted the new cell without fault codes, and charge termination fired correctly at capacity peak — no overcharge event occurred.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning on Ni-MH:\u003c\/strong\u003e\n    After installing, run one full discharge to the laptop's hibernate cutoff, then charge uninterrupted to 100%. Ni-MH cells need this step to let the BIOS battery learn cycle recalibrate — skipping it leaves an inaccurate health warning in the system panel.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% remaining after battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated against the old cell's discharge curve. When the CPU and display pull full load simultaneously, the new cell's voltage drops faster than the IC predicts. The BIOS interprets that voltage cliff as an imminent cutoff and triggers an emergency shutdown. Run two full discharge-to-hibernate cycles followed by uninterrupted charges — the IC recalibrates its endpoint threshold against the new cell's actual voltage curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS reads health data from EEPROM on the battery controller, not from the live cell voltage. After a cell swap, the EEPROM still carries the wear data written by the old unit, so the health indicator stays red. The fix is to complete a full battery learn cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. After one complete cycle, the BIOS rewrites the EEPROM state against the new cell and the poor-health flag clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410855624794,"sku":"BWCS-DR36HB-1","price":89.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410855657562,"sku":"BWCS-DR36HB-2","price":105.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410855690330,"sku":"BWCS-DR36HB-3","price":118.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DR36HB-big.webp?v=1779581376","url":"https:\/\/batteryweb.com\/products\/tatung-tnb5600-replacement-battery-12v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}