{"product_id":"bt-synergy-600-replacement-battery-24v-1200mah-ni-mh","title":"BT Synergy 600 Replacement Battery 2.4V 1200mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBT Synergy 600 \/ 700 — 2.4V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 2.4V, 1200mAh Ni-MH battery replaces the rechargeable pack inside the BT Synergy 600 and Synergy 700 cordless handsets. It slots directly into the handset battery compartment and connects to the charging contacts that feed from the base station. Voltage and cell chemistry match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSynergy 600 and 700 compatibility:\u003c\/strong\u003e\n    Both models run on the same 2.4V dual-cell Ni-MH pack with identical footprint and contact placement. The base station charges at a fixed low current matched to this chemistry — swapping to Li-ion or a different voltage would prevent the base from charging correctly.\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 a Ni-MH test rig. The cell pair held voltage above 2.2V through the working discharge range, and the base station charging contacts accepted the pack without triggering an error state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge conditioning on Ni-MH cordless packs:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in storage state need a slow initial charge to reach rated capacity — a short first charge will result in noticeably reduced talk time until the pack is properly conditioned.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRange dropping mid-call after fitting a new Ni-MH pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Synergy 600 DECT radio draws higher current during transmission bursts. A Ni-MH pack that has not been fully conditioned shows steeper voltage sag under that RF load, which causes the handset to reduce transmit power. This looks like lost range or a choppy signal, but it is a battery voltage issue, not a hardware fault. Run three to five full charge and discharge cycles — range should stabilise as the pack reaches full capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows no charge light after fitting replacement battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH packs sitting in warehouse storage can drop to a resting voltage that falls below the threshold the Synergy base station uses to detect a valid battery. The base sees a voltage too low to register and shows no charge activity. Leave the handset seated in the base for at least 30 minutes — most base stations will begin trickle charging once the pack voltage rises above approximately 2.0V and the detection circuit trips.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339988435034,"sku":"BWCS-BTM500CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339988467802,"sku":"BWCS-BTM500CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339988500570,"sku":"BWCS-BTM500CL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BTM500CL-1.webp?v=1778366983","url":"https:\/\/batteryweb.com\/products\/bt-synergy-600-replacement-battery-24v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}