{"product_id":"ryobi-zrp813-replacement-battery-18v-4500mah-li-ion","title":"18V Ryobi BPL-1815 Replacement Battery 4500mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRyobi ZRP813 \/ P-Series 18V Li-ion 4500mAh Replacement Battery (BPL-1815)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 18V lithium-ion replacement battery rated at 4500mAh (81Wh), cross-compatible with Ryobi's BPL-1815 and P-Series OEM part numbers. It fits the ZRP813 and over 160 additional Ryobi 18V ONE+ platform tools — drills, circular saws, jigsaws, and reciprocating saws included. The connector footprint and BMS handshake match the original Ryobi slide-mount interface.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRyobi 18V ONE+ platform fit:\u003c\/strong\u003e\n    All tools in this list share the same 18V rail voltage, slide-mount connector, and BMS communication protocol. That shared architecture is why one battery pack works across drills, saws, and multi-tools without adapters or firmware changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack on a ZRP813 drill and a circular saw under sustained load. The BMS held steady through repeated motor-start inrush spikes and did not trip overcurrent protection during normal trigger cycling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMotor inrush conditioning on first use:\u003c\/strong\u003e\n    On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent threshold before you hit maximum demand.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff on drill and saw motor-start inrush surge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger hard on a saw or high-torque drill, the motor draws a spike of current — often three to five times the steady-state load — in the first milliseconds of startup. A BMS with a tight overcurrent threshold will read that spike as a fault and cut the pack before the blade or bit even reaches speed. This pack's BMS is calibrated to the inrush profile of Ryobi 18V ONE+ motors, so it distinguishes a normal start surge from a genuine short-circuit event. If you still get cutouts on trigger pull, check the rail contacts on the tool — oxidised contacts increase resistance and distort the current signal the BMS reads.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger blinks red and won't accept the pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRyobi 18V chargers have a minimum acceptance voltage — typically around 13V across the pack. If individual cells self-discharge below that floor during extended storage, the charger rejects the pack entirely and signals with a red blink pattern. The fix is a slow recovery charge: some Ryobi chargers include a \"boost\" or recovery mode that trickle-charges the cells back above the acceptance threshold before switching to normal charge current. If your charger lacks that mode, a compatible Li-ion pack charger set to 0.5A trickle for 10–15 minutes will usually bring cell voltage back above 13V so the standard charger can take over.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416027168858,"sku":"BWCS-RTB820PW-1","price":132.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416027201626,"sku":"BWCS-RTB820PW-2","price":156.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416027234394,"sku":"BWCS-RTB820PW-3","price":174.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RTB820PW-1.webp?v=1779759485","url":"https:\/\/batteryweb.com\/products\/ryobi-zrp813-replacement-battery-18v-4500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}