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Nothing wrong with the batteries - the problem is the GPS!
on 11 June 2014
Several people on here have experienced problems with this battery pack being unable to charge after a few months. I have one to use with my Oregon 600 and have just seen the same problem - battery dead and not charging - less than 6 months after buying it. However, the problem isn't the battery pack...
To put it bluntly, the charging circuits in Garmin's GPS receivers are rubbish. First, they charge the two cells in series rather than individually - this is a big no-no. All decent NiMH chargers charge each cell on its own, monitoring its voltage and temperature so each cell gets the right amount of charge - the Garmin GPS doesn't do this, so will kill the cells eventually anyway.
Furthermore, Garmin's chargers will not even attempt to recharge a battery once the charge has dropped below a certain level - I found this out the hard way when the battery in my £900 Garmin aviation GPS died. If the batteries in your GPS are close to flat, and you then stick it in a drawer for a couple of months, the remaining charge is insufficient for the GPS to decide to charge them, and you are left with a GPS refusing to charge what is actually a perfectly functional battery pack.
If you own a decent standalone charger for NiMH AA batteries, this is easily fixed - you can charge the pack one cell at a time by sticking one side of it into your charger, charging, and then flipping the pack through 180 degrees and repeating.
The trouble is that, if you are having to do this anyway to look after the cells, the battery pack is pretty pointless - the only advantage it has over standard rechargeables is the ability to charge up via USB in the GPS itself, and as above, this will shorten the life of the batteries anyway due to the poorly designed charging system.
Until Garmin incorporate a decent charger into the GPS receivers, this product is more trouble than it's worth - it's a shame, but don't waste your money.