{"product_id":"defelsko-positest-at-a-replacement-battery-72v-3600mah-ni-mh","title":"Defelsko PosiTest AT-A Replacement Battery HHR-17670 7.2V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDefelsko PosiTest AT-A \/ ATA20 — 7.2V Ni-MH Replacement Battery (HHR-17670)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.2V 3600mAh Ni-MH battery replaces part number HHR-17670 in the Defelsko PosiTest AT-A and ATA20 adhesion testers. These are handheld pull-off adhesion instruments used in coating inspection and quality control work. The battery slots into the grip housing and powers the motorised actuator, display, and onboard data logging.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePosiTest AT-A and ATA20 compatibility:\u003c\/strong\u003e\n    Both units run the same 7.2V battery rail and use the same connector orientation and BMS handshake protocol — one pack covers both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through repeated actuator cycles on the AT-A. The BMS held voltage steady through the motor-start surge at pull-off initiation and did not trip under the combined actuator and display draw during multi-point logging sessions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration before field use:\u003c\/strong\u003e\n    After fitting this battery, run a full calibration cycle through the PosiTest AT-A instrument menu before taking it to site. The instrument maps battery state during that calibration sequence — skipping it causes premature low-battery warnings during your first measurement session in the field.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the PosiTest AT-A sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge continuously, even in storage. If the PosiTest AT-A sat in a case long enough, the pack voltage can drop below the BMS recovery threshold — typically around 5.0V for a 7.2V Ni-MH pack. At that point the BMS locks the output circuit and the instrument will not power on, even on charge. A slow pre-charge at low current (0.1C or lower) for 30–60 minutes usually recovers the cells enough for the BMS to release and allow normal charging to resume.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInstrument shuts down mid-pull during adhesion testing\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe motorised actuator in the AT-A draws a sharp current spike at the moment of pull-off initiation. On a depleted or degraded cell, this spike causes a voltage sag that crosses the BMS undervoltage cutoff threshold — the instrument shuts off mid-test and logs an incomplete data point. This is not a firmware fault. Charge the battery fully before a test session and check resting voltage: a healthy pack should read at or above 7.2V at rest before use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360456835162,"sku":"BWCS-DTA200SL-1","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360456867930,"sku":"BWCS-DTA200SL-2","price":80.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360456900698,"sku":"BWCS-DTA200SL-3","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DTA200SL-1.webp?v=1778615882","url":"https:\/\/batteryweb.com\/products\/defelsko-positest-at-a-replacement-battery-72v-3600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}