{"product_id":"micronix-msa338-replacement-battery-48v-4500mah-ni-mh","title":"Micronix MB-300 Replacement Battery 4.8V 4500mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMicronix MSA338 \/ MSA358 — 4.8V Ni-MH Replacement Battery (MB-300)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the MB-300 replacement battery for the Micronix MSA338 and MSA358 survey and test instruments. It runs at 4.8V with a 4500mAh (21.6Wh) Ni-MH cell pack. If your original battery no longer holds a usable charge through a field session, this is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMSA338 and MSA358 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and 4.8V supply rail. The BMS handshake is identical across the two, so one battery spec covers both without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the MSA338's probe initialisation sequence, where inrush current spikes sharply at sensor power-up. The BMS held through repeated cold-starts without tripping the protection circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration cycle:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument menu before heading into the field. The MSA338 and MSA358 map battery state during calibration — skip this step and the instrument will throw premature low-battery warnings on your first measurement session.\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 MSA338 sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge over storage, and if the pack drops below approximately 3.6V total, the BMS enters a protective sleep state. In this condition, the instrument sees no voltage on the battery rail and behaves as if no pack is installed. A standard charger may not wake the cells because its activation threshold is above what the depleted pack can present. Use a charger with a recovery or trickle-charge mode — apply 100mA to 150mA until the pack climbs above 4.0V, then resume normal charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInstrument shuts off mid-session during sustained sensor logging\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDuring continuous data logging, the sensor array draws a steady load that older or degraded Ni-MH cells cannot sustain cleanly. Voltage sags under this load until it crosses the instrument's undervoltage cutoff, triggering an abrupt shutdown — even if the battery indicator showed adequate charge before the session. This is a voltage-sag failure, not a capacity failure, and it appears sooner as cells age. If shutdowns occur consistently after 20–30 minutes of active logging, check resting voltage after a full charge — it should read at or above 5.2V on a fresh pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360791068762,"sku":"BWCS-BP2650SL-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360791101530,"sku":"BWCS-BP2650SL-2","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360791134298,"sku":"BWCS-BP2650SL-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BP2650SL-1.webp?v=1778616258","url":"https:\/\/batteryweb.com\/products\/micronix-msa338-replacement-battery-48v-4500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}