I purchased my first 17Ah SkyWatcher PowerTank right after my first telescope in 2015. Because I didn’t care much about it (I didn’t reloaded it after every use!) the battery died very quickly. So I buyed a second one in 2016.
The second power tank I use until today (huge difference in lifespan, if you take care of it…) but with my new mount and the MGEN it comes to its limits.
And of course I still need power for my Star Adventurer.
Since the tanks are more expensive today than back in 2015/16, I tought it would be a good idea to replace only the battery instead of buying new. The battery costs me around 50.- to 70.- Swiss Francs, a new power tank at least three times that much…
To my surprise I found a 22Ah battery on reichelt.com with the same dimensions. So, I upgraded my first power tank with a 22Ah cycle-proof battery!
PowerTank Battery Replacement
The replacement was done in around 30 minutes. The tank has 16 housing screws and 2 screws for the battery poles. Here are some impressions:
Detached battery cables 
Battery disassembly 
Battery removed 
22Ah battery 
It works!
Warning: Never change the battery while the tank is powered on or connected loading cable! The power switch has to be in center position (Off)!
