{"product_id":"v-tech-5829-replacement-battery-36v-700mah-ni-mh","title":"VTech 5829 Cordless Phone Replacement Battery 3.6V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eV Tech 5829 \/ 5839 \/ 5851 \/ 5859 Series — 3.6V Ni-MH Replacement Battery (80-0099-00-00)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 700mAh Ni-MH battery for V Tech cordless phone handsets in the 5829, 5839, 5851, and 5859 series, plus over 79 additional compatible models. It replaces OEM part numbers 80-0099-00-00, 80-1323-00-00, and 89-1323-00-00. The battery slots into the handset compartment and powers the DECT radio and speaker circuitry away from the base station.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e5829\/5839\/5851\/5859 platform fit:\u003c\/strong\u003e\n    These handsets share the same 3.6V battery bay, connector polarity, and NiMH charge acceptance profile. The base station charges at a fixed trickle rate matched to this chemistry — swapping in a different voltage or chemistry will cause the charge circuit to behave incorrectly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the base station charge cycle and confirmed the BMS accepts the incoming trickle current without triggering a fault light. Discharge curves stayed flat across the rated capacity window before the protection circuit cut off at the low-voltage floor.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge on NiMH cordless handsets:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it for a full 16 hours before use. NiMH cells shipped from storage have partially self-discharged — a slow first charge cycles the cell chemistry to rated capacity. Skipping this step shortens talk time from the first day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTalk time shorter than the original battery after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH cells need three to five full charge-discharge cycles before they reach rated capacity. A new battery will feel weaker than the old original in the first few days — this is normal cell conditioning, not a fault. Each full cycle builds the electrochemical capacity closer to the rated 700mAh. Run the handset until it powers down, return it to the base for a full charge, and repeat for at least three cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station showing no charge or error light after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eBatteries stored in a warehouse can self-discharge below the threshold the base station accepts as a valid NiMH pack. When the terminal voltage is too low, the base charge circuit reads it as a fault and refuses to begin the charge cycle. Place the handset in the base and leave it undisturbed for at least 30 minutes — most base stations will attempt a recovery trickle at around 1.0V per cell. If the error light clears, the charge cycle has started; leave the handset in the base for the full 16-hour initial charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340016779354,"sku":"BWCS-CPB8011-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340016812122,"sku":"BWCS-CPB8011-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340016844890,"sku":"BWCS-CPB8011-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB8011-1.webp?v=1778367024","url":"https:\/\/batteryweb.com\/products\/v-tech-5829-replacement-battery-36v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}