Comcast Battery Backup Replacement

Overall Score: 9 / 10

Material Quality 9

Battery Life 9

Durability 9

No one wants to be without internet service, so a backup battery is always a good bet. A backup battery is a must for anyone who works from home or attends virtual school. Your laptop is useless if you can’t access the internet. Backup batteries also help protect your modem from power surges, lightning, and brownouts. Voltage spikes from these events can fry your modem. Backup batteries range in average charge from 8 to 24 hours, and you have a couple of options when looking for a backup battery. The Arris Touchstone Modem Backup Battery 8 Hr gives you enough time to finish out your work, even without electricity. Read on for an in-depth review of the Arris Touchstone 8 Hr.


Size 3 x 2 x 1 in., 0.352 oz.


WTM552G, WTM652G, TG862G, TG852G, and TM822G

Detailed Review

For less than $15, the Arris Touchstone is much cheaper than buying a replacement backup battery through Comcast. Using a backup battery will give you internet access in the event of an outage, as well as, phone service since Comcast and the major companies use VoIP phone service. If the power goes out and your cell isn’t charged, this little backup battery can save the day and let you make phone calls to let friends or family know you’re okay. The Arris Touchstone Modem Backup Battery 8 Hr is compatible with the following models : WTM552G, WTM652G, TG862G, TG852G, and TM822G.

On Amazon, the Arris Touchstone Modem Backup Battery 8 Hr has 4 out of 5 stars. While other backup batteries claim to last a little longer, most reviewers said the Arris Touchstone performed as expected, that is a full 8 hrs. Only a handful of Amazon reviewers claimed the battery failed to last as promised. This is a negative review on Amazon from a disgruntled customer who states  her battery would not fully charge and only gave her about 25% of the expected battery life. She claims she tried to return it approximately two months after the purchase date, but the seller didn’t honor the warranty. In another review, one user cautioned to not install the battery if you are expecting bad weather and outages as it needs to fully charge when first installed. The majority of reviewers had great things to say, however, like “simple to install,” “worked through several power outages,” or “installed it and it’s been working ever since.”

The battery is a breeze to install. Once installed, it stays in the modem so it will be charged in the event it is needed. Below are the installation instructions.

To Install the Arris Touchstone Modem Battery Backup 8 Hr in your Comcast Modem (model Arris TG852):

  1. Locate the battery compartment on the back of the modem unit. With your finger, press then pull the latch open.
  2. Align the battery so the guidelines meet the lines on the modem, then slide the battery fully into the compartment until it snaps into place. If you don’t have it lined up properly, the battery won’t fully insert.
  3. Then, replace the door. If the battery was correctly installed, the battery light on the front of the modem will now be lit.

For less than $15, the Arris Touchstone Modem Backup Battery 8 Hr makes sense. Simply install it and forget it about it until you need it. If you end up without power, you’ll be convinced it was the best $15 you ever spent.

You Won’t Regret This Buy

Overall, the Arris Touchstone Modem Backup Battery 8 Hr seems to be worth the money. It gives you a solidly reviewed 8 hrs of battery life in the event of a power outage, so you can make phone calls on your landline and continue to use the internet. For those who live in rural areas or places prone to storms, the Arris Touchstone is an easy, affordable backup battery replacement that can make life a little easier. The Arris Touchstone is at least $20 cheaper than Comcast’s backup battery, so this one is really a no-brainer. This reviewer gives it two thumbs up.


  • Compatible with several models
  • Easy to install
  • Affordable price


  • Other backup batteries on the market last longer than 8 hours

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