{"product_id":"pentax-k-7-replacement-battery-74v-1250mah-li-ion","title":"Pentax D-LI90 K-7 Compatible Battery 7.4V 1250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePentax K-7 \/ K-5 \/ 645D \/ K-3 — 7.4V Li-ion Replacement Battery (D-LI90)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1250mAh Li-ion replacement for the Pentax D-LI90 battery cell. It fits the K-7, K-5, 645D, and K-3 bodies, along with the wider D-LI90 compatible range. The cell matches the OEM voltage rail, connector pinout, and physical envelope exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK-series and 645D compatibility:\u003c\/strong\u003e\n    These bodies share the D-LI90 form factor and the same three-pin communication interface. The BMS in each body reads cell voltage and temperature data over that interface — this cell transmits both correctly, so the battery indicator functions normally across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a K-5 body. The BMS accepted the cell without error flags, full-charge cutoff triggered at 8.4V, and protection circuitry tripped correctly on simulated over-discharge at 5.8V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle initialisation on K-series bodies:\u003c\/strong\u003e\n    K-series bodies map the battery-remaining percentage to a known discharge curve. On the first install, charge the cell fully inside the camera body using the OEM or compatible AC adapter — this lets the BMS calibrate its fuel gauge to the new cell's curve before you shoot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the K-7 battery indicator locks at a fixed percentage after inserting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe K-7 stores a learned discharge curve from the previous cell. When a new cell goes in, the body compares real-time voltage readings against that stored profile — if they don't align, the indicator stalls or reads incorrectly. A full charge-and-discharge cycle from inside the camera body clears the old profile and maps a fresh curve. After one complete cycle, the percentage display tracks normally through the cell's actual charge state.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically during a shoot on the K-5 or K-3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the body's voltage-threshold table doesn't match the new cell's discharge curve. The K-5 and K-3 read voltage at fixed intervals and translate that to a percentage using a pre-mapped table — a replacement cell with a slightly different mid-discharge plateau causes the reading to skip steps. The fix is the same calibration cycle: charge fully in-body to 8.4V, shoot until the low-battery warning triggers, then recharge fully. The body re-maps the table on that first full cycle and the display stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333822021722,"sku":"BWCS-DLI90MC-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333822054490,"sku":"BWCS-DLI90MC-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333822087258,"sku":"BWCS-DLI90MC-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DLI90MC_1.webp?v=1778213246","url":"https:\/\/batteryweb.com\/products\/pentax-k-7-replacement-battery-74v-1250mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}