Best replacement batteries for electronic dog collars

Start with the Dogtra BP37W — it's the safest default: a genuine Dogtra 3.7V lithium-polymer pack for Arc and StarWalk collars, so it drops straight in with no wiring or guesswork. Match the model number on your collar's battery before ordering; that's the whole game here.

• Garmin collars (Pro series): the PRO Series pack is the direct fit, with more capacity than the Dogtra pack.
• Garmin T5 / TT15 Mini: the 1200 mAh upgrade gives noticeably longer runs between charges.
• Dogtra BPRR (7.2V NiMH): the right chemistry for older Dogtra receivers — don't substitute a lithium pack.
• SportDog SD425/SD825: a dedicated SportDog pack, no adapter needed.
• PetSafe bark collars: the RFA-67 6V cells are the cheap, buy-in-bulk option.
• Multiple collars in a kennel: the MS-5 six-pack keeps spares on hand.

Buy by exact model, not by brand alone — a wrong voltage can kill the receiver.