{"product_id":"kastar-4-pack-bp-21-battery-and-ac-wall-charger-replacement-extra","title":"Kastar 4-Pack BP-21 Battery and AC Wall Charger Replacement - Extra","description":"\u003cp\u003eIn this review the Kastar 4-Pack BP-21 Battery and AC Wall Charger replacement is presented as a budget-conscious power kit for photographers who use Sigma SD1, SD1 Merrill, SD14 and SD15 cameras. The bottom line: this bundle is for people who need multiple spare \u003cstrong\u003eBP-21 compatible batteries\u003c\/strong\u003e and a compact charger that accepts worldwide AC voltage. The package includes four 2400mAh lithium-ion cells and one foldable-pin AC charger, making it a simple way to extend shooting time without carrying proprietary or single-use power solutions.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh capacity cells:\u003c\/strong\u003e Each battery is 2400mAh at 7.4V, offering substantially longer runtime than many original cells when shooting stills or limited video clips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact wall charger:\u003c\/strong\u003e The included AC charger folds its flat pin for easy storage and travel, so it tucks into a camera bag without adding bulk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide input range:\u003c\/strong\u003e The charger accepts AC 100~240V 50~60Hz, which allows use in most countries with an appropriate adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClear charge indication:\u003c\/strong\u003e A red LED shows charging and a green LED shows standby or full charge, making it easy to know battery status at a glance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e The batteries and charger are compatible replacements for Sigma BP-21 and Sigma BC-21 models and cross-compatible with several Konica Minolta, Pentax and Samsung models listed by the maker.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis kit suits hobbyists and working photographers who want multiple spare batteries for long shoots, travel, or field work and prefer a single compact AC charger rather than multiple single-use power sources. It is especially useful for owners of Sigma SD-series cameras and compatible Konica Minolta, Pentax, or Samsung cameras who value capacity and cost savings over OEM branding.\u003c\/p\u003e\n\u003cp\u003eThose who need in-car charging, a European plug included, or a branded OEM charger with bundled accessories should look elsewhere, since the package does not include a car adapter or alternate plug types and focuses on the 4 batteries plus one AC wall charger only.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh 2400mAh capacity per cell provides extended runtime for long sessions.\u003c\/li\u003e\n\u003cli\u003eThe foldable-pin AC charger is compact and accepts 100-240V, useful for travel with a local adapter.\u003c\/li\u003e\n\u003cli\u003eSimple LED indicators make it clear when batteries are charging or ready.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNo car adapter or alternate plug types are included, so additional accessories may be needed for some users.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003eLithium-Ion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Voltage\u003c\/td\u003e\n\u003ctd\u003e7.4V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Capacity\u003c\/td\u003e\n\u003ctd\u003e2400mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharger Input\u003c\/td\u003e\n\u003ctd\u003eAC 100~240V 50~60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharger Output\u003c\/td\u003e\n\u003ctd\u003eDC 8.4V 600mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Contents\u003c\/td\u003e\n\u003ctd\u003e4-Pack Batteries + 1 AC charger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Kastar 4-Pack BP-21 kit is a practical, cost-effective option for photographers who need multiple spare batteries and a compact charger with international voltage support. It delivers good capacity and simple LED charging feedback, making it a smart buy for Sigma SD-series users and compatible camera owners who prioritize runtime and value over OEM packaging.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these batteries compatible with Sigma BP-21?\u003c\/strong\u003e\u003cbr\u003eYes, these lithium-ion batteries are listed as replacements compatible with Sigma BP-21 battery models.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the charger work worldwide?\u003c\/strong\u003e\u003cbr\u003eThe charger accepts AC 100~240V 50~60Hz so it will work worldwide with the appropriate local plug adapter; a European plug or car adapter is not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many batteries are included?\u003c\/strong\u003e\u003cbr\u003eThe package includes four 2400mAh batteries and one AC wall charger, with no car adapter or alternate plug types included.\u003c\/p\u003e","brand":"Kastar","offers":[{"title":"Default Title","offer_id":48193647247579,"sku":"B08CT4ZV7H","price":34.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81BEDGIkMDL._AC_SL1500_07bdce47-97a5-4bb2-b656-7143978fe7a0.jpg?v=1770218283","url":"https:\/\/gearmusthave.com\/products\/kastar-4-pack-bp-21-battery-and-ac-wall-charger-replacement-extra","provider":"GearMustHave","version":"1.0","type":"link"}