{"product_id":"custom-battery-packs-replacement-battery-36v-2250mah-li-ion","title":"Custom Battery Packs 1ICP\/18\/650 Replacement Battery 3.6V 2250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCustom Battery Packs 1ICP\/18\/650 1S1P — 3.6V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 2250mAh (8.1Wh) lithium-ion single-cell replacement pack for the Custom Battery Packs 1ICP\/18\/650 1S1P configuration. It measures 66.00 × 21.80 × 18.50mm, matching the original cell footprint. Use it when the original pack has degraded capacity or fails to hold a charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSingle-cell 1S1P configuration:\u003c\/strong\u003e\n    One cell, no series or parallel wiring — voltage stays at the nominal 3.6V rail the host device expects. There is no mid-pack balancing circuit to negotiate, so the BMS handshake depends entirely on cell voltage being within the device's acceptance window at installation time.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a cell analyser. The BMS cutoff triggered correctly at the low-voltage threshold, and the charge termination stepped down cleanly from bulk to taper current without anomaly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration after swap:\u003c\/strong\u003e\n    After installing, run one full charge-discharge cycle before trusting the capacity indicator. Integrated fuel gauges track coulombs against the old cell's profile — they need one full cycle against the new cell to recalibrate the state-of-charge reading accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack not accepted by device after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome host devices run a voltage-range check at power-on before allowing the pack to discharge. A new cell ships at storage voltage — typically 3.6V to 3.7V — which can sit just outside the acceptance window on certain charge ICs. If the device rejects the pack immediately after installation, place it on charge for a full cycle first. Once the cell reaches 4.1V–4.2V, the host's voltage check will clear and normal operation resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack not reaching full charge on the first cycle\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle, the charge IC may limit current more aggressively than it will on subsequent cycles. This is normal — the controller is characterising the new cell's internal resistance before allowing full current. The result is a longer first charge and a capacity reading that appears low. Run a second full charge-discharge cycle and verify the pack reaches 4.20V at termination.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333480874074,"sku":"BWCS-CM039SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333480906842,"sku":"BWCS-CM039SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333480939610,"sku":"BWCS-CM039SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CM039SL-1.webp?v=1778212809","url":"https:\/\/batteryweb.com\/products\/custom-battery-packs-replacement-battery-36v-2250mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}