{"product_id":"medcaptain-tp-20s-replacement-battery-74v-1500mah-li-ion","title":"Medcaptain TP-20S 7.4V 1500mAh Li-ion Compatible Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedcaptain TP-20S — 7.4V Li-ion Replacement Battery (IPC494252)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 1500mAh Li-ion battery replaces the IPC494252 (21CP6\/43\/52) cell pack in the Medcaptain TP-20S portable infusion pump. It fits the TP-20S directly, matching the original voltage rail and connector configuration. Capacity is 1500mAh (11.1Wh), matching the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTP-20S battery platform:\u003c\/strong\u003e\n    The TP-20S uses a 7.4V two-cell Li-ion pack with a BMS that handshakes at startup to verify cell chemistry and voltage balance. This replacement uses the same cell configuration so the BMS recognises it without throwing a fault code on boot.\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 the TP-20S platform and monitored BMS communication. The protection circuit engaged correctly at low-voltage cutoff, and the charge IC accepted the cell without triggering an incompatibility flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup sequence:\u003c\/strong\u003e\n    After installing this battery, let the TP-20S complete its full power-on self-test without interruption. The device runs a BMS verification step at every boot — cutting power during this sequence creates a latching battery fault that will not clear until the next clean, uninterrupted startup.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the TP-20S flags a battery fault after a fresh swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TP-20S BMS stores calibration data from the previous cell and compares it against the new pack at first boot. A new cell that has not yet completed one full charge-discharge cycle may sit just below the BMS threshold the device expects from a fully conditioned pack. This causes the device to flag a fault even when the battery reads full voltage on a charger. Running one complete charge and discharge cycle before clinical use trains the BMS to accept the new cell's capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stalls below 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first charge cycle, the TP-20S charge IC applies a conservative current limit to an unrecognised cell, which causes the charge progress to stall visibly below 100% for an extended period. This is not a faulty battery — the IC is applying a trickle-top phase while it measures cell response. Allow the charge cycle to complete fully without disconnecting the device. Once the first full cycle finishes, subsequent charges will reach 100% at normal speed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381396406362,"sku":"BWCS-MPT200MD-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381396439130,"sku":"BWCS-MPT200MD-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381396471898,"sku":"BWCS-MPT200MD-3","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPT200MD-1.webp?v=1778900536","url":"https:\/\/batteryweb.com\/products\/medcaptain-tp-20s-replacement-battery-74v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}