{"product_id":"sumitomo-type-25-replacement-battery-111v-3400mah-li-ion","title":"Sumitomo Type-25 Replacement Battery 11.1V 3400mAh BU-25","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSumitomo Type-25 \/ Type-25e Fusion Splicers — 11.1V Li-ion Replacement Battery (BU-25)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 3400mAh Li-ion replacement for the Sumitomo BU-25 battery pack. It fits the Type-25, Type-25e, and related fusion splicer models used in fibre optic splicing and field cable work. Capacity figures come from the product data — 37.74Wh — not from third-party sources.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eType-25 and Type-25e platform fit:\u003c\/strong\u003e\n    Both models run the same 11.1V three-cell configuration and share the BU-25 form factor, connector pinout, and BMS communication protocol. A pack built for one slots into the other without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the splicer's arc calibration sequence and motor alignment cycle. The BMS held stable through the combined motor and arc discharge spike, with no mid-cycle cutoff or error flags thrown on the splicer display.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-storage initialisation before field use:\u003c\/strong\u003e\n    If the pack has sat in transit or storage, run a full arc calibration cycle through the splicer menu before deploying to site. The Type-25 maps battery state during calibration — skipping it causes the low-battery warning to trigger early on the first real splicing session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Type-25 cuts out during motor alignment or arc discharge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Type-25 pulls a brief high-current spike when the fibre alignment motors engage and again when the arc fires. If the pack's internal resistance has risen — common in aged cells — that spike drops cell voltage below the BMS cutoff threshold momentarily. The splicer reads this as a low-battery condition and shuts down to protect the splice. A fresh pack with low internal resistance handles the spike without tripping. If shutdowns occur with a new pack, check that the battery contacts on the splicer bay are clean and seated flush.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack will not charge after months sitting unused in the carry case\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that self-discharge below approximately 2.5V per cell trigger a BMS sleep state — the pack appears dead and the splicer charger shows no activity. This is a protection lockout, not cell failure. Some chargers include a recovery or boost mode that applies a low pre-charge current to bring cell voltage back above the re-initialisation threshold. If the charger does not have this mode, place the pack on charge for 15–30 minutes regardless of indicator status — enough current often bleeds through to wake the BMS. Recovery is unlikely if cells have sat below 2.0V per cell for an extended period.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360551698522,"sku":"BWCS-STU250XL-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360551731290,"sku":"BWCS-STU250XL-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360551764058,"sku":"BWCS-STU250XL-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-STU250XL-1.webp?v=1778615963","url":"https:\/\/batteryweb.com\/products\/sumitomo-type-25-replacement-battery-111v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}