{"product_id":"3gen-dermlite-4-replacement-battery-37v-1500mah-li-ion","title":"3GEN DermLite 4 Compatible Battery 3.7V 1500mAh DL4-1306a","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003e3GEN DermLite 4 — 3.7V Li-ion Replacement Battery (DL4-1306a)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1500mAh Li-ion battery fits the 3GEN DermLite 4 and DermLite DL4W handheld dermoscopes — clinical imaging devices used by dermatologists for skin lesion examination and documentation. It replaces OEM part numbers DL4-1306a and DL4B. Capacity is 5.55Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDermLite 4 and DL4W compatibility:\u003c\/strong\u003e\n    Both devices share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one cell fits both. The BMS in each model reads cell chemistry and capacity data at startup; this replacement passes that verification once it completes its first full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the DermLite 4 power-on sequence and monitored BMS communication. The charge IC applied a conservative initial current limit on the first charge, which is normal — the cell accepted a full charge by cycle two and held voltage within spec across the imaging load profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the DermLite 4 to complete its full power-on self-test without interruption. The device runs a BMS verification routine at boot. Cutting power during that sequence stores a false battery fault that persists until the next clean reboot 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 DermLite 4 flags a battery fault on the first boot after a swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DermLite 4 BMS validates cell chemistry and state-of-charge at every startup. A freshly installed cell that has not completed one full charge-discharge cycle may present a resting voltage that sits below the device's internal acceptance threshold — typically around 3.6V. The BMS interprets this as a degraded or incompatible cell and logs a fault. One full charge followed by normal use clears the flag permanently.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stuck below 100% after first charge completes\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge, the DermLite 4 charge IC applies a reduced current ceiling to a new cell — this is deliberate cell conditioning, not a fault. The indicator may plateau at 90–95% and stop climbing before the charge terminates. This happens because the IC holds the cell at a lower constant-voltage ceiling until it confirms stable internal resistance. Discharge fully once and recharge — the indicator reaches 100% from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381382545498,"sku":"BWCS-GDL400MD-1","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381382578266,"sku":"BWCS-GDL400MD-2","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381382611034,"sku":"BWCS-GDL400MD-3","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GDL400MD-1.webp?v=1778900493","url":"https:\/\/batteryweb.com\/products\/3gen-dermlite-4-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}