Introduction
Tools
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            To remove the cover, use plastic removal tool on the seam of the case. 
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            Once enough force is applied, you should hear a “click” sound which indicates that cover is loose. 
 
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            Once the old battery id removed, slide the new battery, with the positive/negative indicator facing up, in so that the contacts of the battery make contact with the contacts of the phone. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
One comment
Has ifixit thought about trying to make a replacement battery that would work with this? It would be good to be able to get the battery from here as well, even if it is potentially a niche market for these old phones.