{"product_id":"lazer-runner-compatible-6800-mah-4-cell-li-ion-battery-pack-replacement-battery-74v-5200mah-li-ion","title":"Lazer Runner 7.4V Li-Ion Compatible Battery 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLazer Runner ICR18650 2S2P — 7.4V Li-ion Replacement Battery (ICR18650 2S2P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 5200mAh Li-ion battery replaces the 4-cell pack in Lazer Runner laser tag equipment. It uses an ICR18650 2S2P cell configuration — two cells in series, two in parallel — matching the original voltage rail and connector. If your Lazer Runner unit is losing power mid-session or failing to hold charge, this is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2S2P laser tag platform:\u003c\/strong\u003e\n    Lazer Runner packs in this category run a 7.4V nominal rail. The 2S2P layout keeps cell voltages balanced and gives the BMS enough headroom to manage draw spikes when IR emitters fire in burst sequences.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell configuration through charge and discharge cycles on a 7.4V Li-ion test rig. The BMS cut in correctly at low-cell threshold and balanced across both parallel pairs without flagging a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eIR emitter care after battery swap:\u003c\/strong\u003e\n    After fitting a fresh pack, power-cycle the Lazer Runner unit once before entering play. Some IR emitter circuits re-initialise their output calibration on first boot from a full-charge state — skipping this can leave signal range below spec until the next restart.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy Lazer Runner IR range drops before the battery reads empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIR emitter output in laser tag hardware is voltage-sensitive. As cell voltage sags under load — even before the pack hits its low-battery indicator — emitter forward current drops, and with it, effective signal range. The 2S2P layout helps distribute load across cells, but individual cell mismatch in an aged pack accelerates this sag. A new 5200mAh pack restores the full 7.4V rail and brings emitter output back to rated current.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLazer Runner unit not powering on after sitting unused for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the pack drops below approximately 2.5V per cell, the BMS enters deep-discharge protection and blocks output to prevent damage. The unit appears completely dead — no indicator lights, no response. To recover, connect the pack to a compatible 7.4V Li-ion charger and leave it for at least 15–20 minutes; most BMS circuits will re-initialise once the charger pushes cell voltage above 3.0V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381278441562,"sku":"BWCS-LRN100SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381278474330,"sku":"BWCS-LRN100SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381278507098,"sku":"BWCS-LRN100SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LRN100SL-1.webp?v=1778899919","url":"https:\/\/batteryweb.com\/products\/lazer-runner-compatible-6800-mah-4-cell-li-ion-battery-pack-replacement-battery-74v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}