{"product_id":"chattanooga-phyiso-replacement-battery-48v-2000mah-ni-mh","title":"Chattanooga Phyiso 4.8V Ni-MH Replacement Battery 941213","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eChattanooga Phyiso \/ Rehab \/ Theta — 4.8V Ni-MH Replacement Battery (941213)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 2000mAh Ni-MH replacement battery for the Chattanooga Phyiso, Rehab, and Theta electrotherapy units. These portable physical therapy devices use this cell pack to deliver therapeutic stimulation in clinical and rehabilitation settings. The OEM part number is 941213.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePhyiso, Rehab, and Theta compatibility:\u003c\/strong\u003e\n    All three models share the same 4.8V cell configuration, connector pinout, and BMS handshake protocol — one pack fits across the platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on the Phyiso platform. The BMS completed its verification handshake without fault flags, and cell voltage balanced correctly across all four Ni-MH cells.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, allow the device to complete its full power-on self-test without interrupting it. The Phyiso runs BMS verification at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Phyiso flags a battery fault after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Phyiso's charge IC uses a chemistry-specific termination algorithm tuned for the OEM cell's internal resistance profile. A new replacement cell has a slightly different resistance signature until it completes one or two full charge-discharge cycles. During this break-in window, the BMS may log a fault even when the pack is fully charged. Running one complete cycle — full charge, then normal clinical use to depletion — calibrates the charge IC to the new cell and clears the fault condition.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not power on after the battery sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–3% per day at room temperature. A pack stored for several months can drop below the Phyiso's BMS recovery threshold — typically around 4.0V for a 4.8V pack — which causes the device to refuse to power on. Place the battery on charge for a full uninterrupted cycle before attempting to boot the unit. If the charger does not register the pack, check that the terminal voltage has not dropped below 3.6V, at which point a trickle pre-charge may be needed to recover the cells.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381487894618,"sku":"BWCS-CMA150MD-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381487927386,"sku":"BWCS-CMA150MD-2","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381487960154,"sku":"BWCS-CMA150MD-3","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CMA150MD-1.webp?v=1778901248","url":"https:\/\/batteryweb.com\/products\/chattanooga-phyiso-replacement-battery-48v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}