Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Compare

Dogtra BP37W Replacement Battery vs SportDog SD-1275 Replacement Battery

These are not interchangeable parts. The Dogtra BP37W is a 3.7V 280mAh pack built for Dogtra ARC800 and ARC802 receivers. The SportDog SD127SL is a 7.4V 500mAh pack for SportDog SportTrainer SD-1275 collars. Buy the one that matches your device's brand and voltage; the other will not work and could damage the unit. Owners of each system generally report the OEM packs fit cleanly and hold charge well, so the deciding factor is your collar, not the battery.

  • Choose the Dogtra BP37W if you own a Dogtra ARC800, ARC800 Free Plus receiver or ARC802 and need a replacement receiver battery.
  • Choose the SportDog SD127SL if you own a SportDog SportTrainer SD-1275 collar and need its 7.4V replacement pack.

Prices

  • Dogtra BP37W Replacement Battery: $11.95 at Amazon (last seen Nov 9)
  • SportDog SD-1275 Replacement Battery: $18.49 at eBay (last seen Nov 9)
  • Difference: the Dogtra BP37W Replacement Battery is $6.54 cheaper than the SportDog SD-1275 Replacement Battery at the latest prices (Nov 9)
Dogtra
Dogtra BP37W replacement battery for Arc StarWalk

Dogtra BP37W Replacement Battery

Dogtra BP37W replacement battery for Arc StarWalk

$11.95at AmazonChecked Nov 9
See all prices and details
Visit Amazon

As an Amazon Associate, Deal.ai earns from qualifying purchases.

Pros
  • Exact fit for Dogtra ARC800 and ARC802 receivers
  • Correct 3.7V output for those receivers
  • Lithium polymer chemistry
  • Genuine Dogtra part number BP37W
Cons
  • Lower capacity than the SportDog pack
  • Only fits Dogtra ARC receivers
  • Not usable in SportDog collars
SportDog
SportDog SportTrainer SD-1275 Battery 7.4V 500mAh Li-Pl SD127SL

SportDog SD-1275 Replacement Battery

SportDog SportTrainer SD-1275 Battery 7.4V 500mAh Li-Pl SD127SL

$18.49at eBayChecked Nov 9
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Higher 500mAh capacity
  • Correct 7.4V output for the SD-1275
  • Genuine SportDog part number SD127SL
  • Compact 46g pack
Cons
  • Only fits the SportDog SportTrainer SD-1275
  • Double the voltage of the Dogtra pack, so no crossover
  • DG9 hazardous class adds shipping limits

What separates them

Dogtra BP37W Replacement BatterySportDog SD-1275 Replacement Battery
Voltage3.7V7.4V
Capacity280mAh500mAh
Device compatibilityDogtra ARC800, ARC800 Free Plus receiver, ARC802SportDog SportTrainer SD-1275
ChemistryLithium polymerLithium polymer
Part numberBP37WSD127SL
WeightNot listed46g
Shipping restrictionsLithium battery rules applyDG9 hazardous class, lithium battery rules apply

Price history

$23.99$9.99
Nov 1Nov 10
  • Dogtra BP37W Replacement Battery: lowest $11.95 on Nov 1 at Amazon; $19.99 on Nov 10.
  • SportDog SD-1275 Replacement Battery: lowest $9.99 on Nov 10 at Amazon.

Prices at every store

Dogtra BP37W Replacement Battery

  • Buy and Sell Hunting DogsNew

    In stock

    $19.99Checked 3 h ago
    Visit Buy and Sell Hunting Dogs
  • HuntEmUp.comNew

    In stock

    $19.99+ $7.65 shippingChecked 3 h ago
    Visit HuntEmUp.com
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $11.95Checked Nov 9
    Visit Amazon
  • eBayNew

    Availability unknownSold by batterycentre3 (99.7% positive, 25,300 ratings)Ships from China · duties may applyReturns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $12.05Free shippingChecked Nov 9
    Visit eBay

Also available at

  • eBayCheck price at eBay

Store links may earn us a commission.

All 9 stores and price history →

SportDog SD-1275 Replacement Battery

  • eBayNew

    Availability unknownSold by startong_battery (99.5% positive, 1,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $18.49Free shippingChecked Nov 9
    Visit eBay
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $9.99+ $12.99 shippingChecked 3 h ago
    Visit Amazon

Store links may earn us a commission.

All 2 stores and price history →

Specs compared

SpecDogtra BP37W Replacement BatterySportDog SD-1275 Replacement Battery
Battery Capacity280MAH—
Battery Voltage3.7v—
Battery Chemistry TypeLithium Polymer—
Compatible BrandDogtra—
Compatible DevicesARC800, ARC800 Free Plus Receiver, ARC802—
Compatible ModelBP37W—
Compatible Device TypeReceiver—
MaterialLithium Polymer—
Voltage—7.4V
Capacity—500mAh
Technology—Lithium Polymer (LiPo)
Wattage—3.70Wh
Show all 18 specsShow fewer specs
SpecDogtra BP37W Replacement BatterySportDog SD-1275 Replacement Battery
Weight—46g
Length—35.6
Width/Diameter—25
Height—11.8
Colour—Black
Product Model—SD127SL

Questions and answers

Will the Dogtra BP37W fit a SportDog collar?
No. It is a 3.7V pack shaped for Dogtra ARC800 and ARC802 receivers. The SportDog SD-1275 needs a 7.4V pack.
Can I use the SportDog SD127SL in a Dogtra receiver?
No. At 7.4V it is double the Dogtra receiver's 3.7V and could damage it. Use the BP37W instead.
Which battery lasts longer per charge?
The SportDog SD127SL has the higher capacity at 500mAh versus 280mAh, but it powers a different collar, so compare runtime within each system, not across them.
Are these genuine manufacturer batteries?
Both are listed as original-brand packs with their own part numbers, BP37W for Dogtra and SD127SL for SportDog.
Do these ship by air?
Lithium batteries face shipping restrictions. The SportDog pack is classed DG9, so ground shipping is common for both.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

More comparisons

  • Garmin TB10 and PT10 Replacement Dog Collar Battery vs Dogtra BP37W replacement battery for Arc StarWalk
  • Garmin TB10 and PT10 Replacement Dog Collar Battery vs SportDog SportTrainer SD-1275 Battery 7.4V 500mAh Li-Pl SD127SL
  • Dogtra BP37W replacement battery for Arc StarWalk vs Dogtra BPRR Battery 7.2V 700mAh - Compatible Replacement
  • PRO Series Battery for Pro Collars vs Dogtra BP37W replacement battery for Arc StarWalk
  • Battery Upgrade for Garmin T5 and TT15 Mini Tracking Dog Collars vs Dogtra BP37W replacement battery for Arc StarWalk

Buying guides that pick them

  • Best replacement batteries for electronic dog collars