{"product_id":"samsung-helix-replacement-battery-37v-2000mah-li-ion","title":"Samsung Helix MP3 Player Replacement Battery 3.7V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Helix \/ YX-M1Z \/ XM5 — 3.7V Li-ion Replacement Battery (990216)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion battery rated at 2000mAh (7.4Wh), built to the OEM part number 990216. It fits the Samsung Helix, YX-M1Z, XM5, and XM Radio portable media players. If your original cell has degraded after years of use, this replacement restores normal playback function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHelix \/ YX-M1Z \/ XM5 compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell Li-ion architecture, connector pinout, and BMS handshake protocol — one cell covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a Helix unit. The BMS accepted the charge curve without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap initialisation on the Helix:\u003c\/strong\u003e\n    After installing a new cell, connect the Helix to its charger before attempting to power on. A fresh or stored cell may sit below the BMS wake threshold, and the player will not respond to the power button until the charger pushes it past that floor.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping after cell swap on the Helix\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Helix uses a voltage-threshold fuel gauge — it estimates charge level by reading cell voltage at fixed intervals rather than tracking coulombs. After a cell swap, the gauge has no baseline, so it maps voltage readings to percentage using a cold lookup table. This produces jumpy or inaccurate readings for the first several charge cycles. Run two or three full charge-to-discharge cycles and the displayed percentage will stabilise as the gauge recalibrates its endpoints.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePlayback cutting out before the battery indicator shows empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe audio amplifier in the Helix draws a short current spike during playback — particularly at higher volume. Near the end of a discharge cycle, cell voltage sags under that load and briefly drops below the amplifier's minimum operating voltage. The player interprets this as a fault and cuts audio even though the gauge still shows remaining charge. This is a cell voltage sag issue, not a firmware or headphone fault. Reducing playback volume by a few steps at low charge levels keeps the voltage above the threshold and prevents the cutout.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381340504154,"sku":"BWCS-PXM2SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381340536922,"sku":"BWCS-PXM2SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381340569690,"sku":"BWCS-PXM2SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PXM2SL-1.webp?v=1778900030","url":"https:\/\/batteryweb.com\/products\/samsung-helix-replacement-battery-37v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}