{"product_id":"optoma-pk201-replacement-battery-37v-1350mah-li-ion","title":"Optoma PK201 Replacement Battery 3.7V 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOptoma PK201 \/ PK301 — 3.7V Li-ion Replacement Battery (BBPK3ALIS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1350mAh Li-ion battery for the Optoma PK201 and PK301 pocket projectors. It slots into either unit and restores wireless operation for mobile presentations away from a wall outlet. Capacity matches the original 5Wh specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePK201 and PK301 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — 65.00 × 38.50 × 5.50mm cell footprint with identical charge termination voltage. One part number covers both units.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the PK201's internal charge circuit and confirmed the BMS accepted charge termination correctly and reported state-of-charge accurately on the projector's battery indicator.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLamp brightness and draw management:\u003c\/strong\u003e\n    Set the PK201 or PK301 to eco mode when running on battery. Full brightness pulls 30–40% more current from the cell than eco mode. In most presentation environments, the visible difference is negligible, but the current draw difference is not.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the PK201 shuts off before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe LED lamp module in the PK201 requires a higher minimum supply voltage than the projector's low-battery cutoff threshold is set to catch. When the cell drops below roughly 3.2V under the lamp's load, the projector loses the voltage headroom the lamp driver needs and cuts power — even if the battery indicator still shows a bar or two. This is a lamp driver voltage floor issue, not a faulty battery. A fresh cell with full capacity reduces how quickly you hit that floor.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery indicator shows full but projector won't start\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA deeply discharged Li-ion cell can sit below the BMS re-initialisation threshold — the projector sees a connected battery but the BMS has locked output to protect the cell. The battery indicator reads incorrectly because the projector is sampling open-circuit voltage, not a live discharge load. Connect the projector to mains power first and leave it on charge for at least 15 minutes before attempting to boot on battery alone. If the BMS recovers, the indicator will reset; charge to 4.2V before the next battery-only session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416088445018,"sku":"BWCS-OPK201PT-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416088477786,"sku":"BWCS-OPK201PT-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416088510554,"sku":"BWCS-OPK201PT-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OPK201PT-1.webp?v=1779760241","url":"https:\/\/batteryweb.com\/products\/optoma-pk201-replacement-battery-37v-1350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}