Often enough we get asked, which battery goes with my battery operated soldering irons?

  • Model 7700, 7740 soldering irons replacement battery Model #7733.
  • Model 8000 soldering irons replacement battery Model #8033.

Quick FixBattery Repair for Iso-Tip Soldering Irons

Replacing the battery in our #7700 and #8000 is simple. These instructions are also included in the product manual.

  1. Pull out three screws from the case. Disassemble cover carefully.
  2. Remove switch contact screw. Lift switch spring and tip holder assembly up and remove from the unit.
  3. Remove battery pack by removing two screws at ends of battery pack. Keep your screws!
  4. Install the new battery with those two screws we told you to keep.
  5. Replace switch spring and tip assembly in case. Use caution! Do NOT touch the other tip assembly.
  6. Replace switch contact screw.
  7. Replace cover and three screws.
  8. Let your soldering iron charge for 4-6 hours.

Iso-Tip Battery Operated Soldering Irons Rebuild Program

Most of our customers are really smart humans…after all they bought from us and they know how to fix stuff. As a loyal Iso-Tip customer, you have several options when replacing this battery. First option is to just send it in to us and let us go through the tool, then test and repair anything else the iron or charger may need. Here’s more information about our rebuild program. The other is for do it yourself, which we all like to try at least twice. All this information can be found in your product manual that came with the tool, but if you’re like us you’ve misplaced it, so here’s an electronic copyHappy Soldering!

Other Battery FAQs

  • What kind of battery does it use?
    • Our 7700 battery is Nickel-cadium (NiCd) battery.
    • Our 8000 battery is LiFePO4 Battery a Lithium-Iron Phosphate Battery
  • My boss requires I have a safety data sheet, can I get one for the battery from you?
  • If I leave my Iso-Tip in the charging stand, will it over charge?
    • You CAN leave your Iso-Tip in the charger when not in use – it will NEVER over-charge. The charger can be unplugged if long periods of non-use are expected. If the soldering iron is left in the stand and the recharging stand is disconnected or turned off the iron will discharge.
  • What if I don’t solder that often?
    • Ensure a longer battery life by using the tool frequently. Even when you don’t solder, it is a good practice to completely discharge the batteries by normal use at least once a month. Batteries can lose their max capacity if this is not done.
  • What is the normal rate of self-discharge for a 7700 battery? Or, what is ~half-life of charge if not in the charger? Is a high self-discharge rate a sign of an elderly battery?
    • For the 7700 normal battery life (discharge rate) would be 125 solder joints per full 4 hour charge.
  • It looks like I just changed the battery. Only issue was that the contacts on the battery ends didn’t line up with the contacts in the body of the tool. Some “finagling” with a pair of pliers seems to have worked.
    • It sounds like you’ve got an older iron on your hands. The old irons have a slightly different body than the current ones, so the battery tabs don’t line up quite right. That’s a good suggestion, and one that we will make sure to let users know going forward.
  • I have an old orange iron #7700 (WAHL). The charger is different from the new gray #7700 in that the transformer is external to the charger. Can this orange model be left in the charger without overcharging?
    • Yes, you can leave the orange model in the charger without it overcharging.
  • My 7700 has a NiCd battery. Can I replace it with NiMh?
    • Yes, you can replace a NiCd battery with a NiMh battery. Just make sure that it’s 2.4V and isn’t too large to fit in the case.
  • I am looking for a replacement battery for the Iso-tip Model 7550. Does anyone know where to get one or an equivalen?.
    • Our 7733 battery should work as a replacement for the 7575.
  • What voltage should be measured from the Wahl 7500 charger?
    • The output should be about 1.7 volts.
  • What if I’m not comfortable with replacing the battery myself?

Battery Repair for Iso-Tip Soldering IronsBattery Repair for Obsolete Iso-Tip Soldering Irons

Good news! (Especially for those of you with older Iso-Tip soldering irons.) We’ve learned that Batteries Plus performs battery repair for Iso-Tip soldering irons. So, if you happen to own a model we no longer manufacture, Batteries Plus may be able to help extend the tool’s life by rebuilding the battery. One of our fellow Wisconsinites passed on that little tid-bit of information after he had his 7500 series rebuilt in November. (Thank you, Steve!) And with more than 380 locations in 43 states, you sure to find a Batteries Plus near you. For location information, visit their website.

We do carry a replacement battery for models #7700, #7740 and #7750 which is part number #7733. Crafted exclusively for our gray, orange or black models. We also carry a replacement battery for our #8000 iron, part number 8033.

Iso-Tip also offers replacement batteries for our current and some older production models for our customer’s to purchase. Click here to visit our online store.